Tribler

This release bundles Libtorrent with BEP33 DHT scrape enabled to improve popular torrent sharing.

**Changelog**
- Fixed the installation name of PIL in dependencies
- Added a VENV option when building Tribler
- Logged traceback timestamp on crash
- Caught TimeoutError when checking API version
- Only alive torrents are sent on popularity share
- Updated torrent checker to start before popularity community
- Fixed torrent checker test
- Fixed remote updating channel node with type change
- Fixed database session over error

This is a minor release with a heavy focus on bug fixes. We have addressed most of the issues reported in Tribler 7.5.1 and plan to fix the remaining issues in our next release.

Important changes:
* Updated Python interpreter to Python 3.8
* Disabled embedded VLC video player due to compatibility problems
* Updated Libtorrent version to 1.2.4 in Windows builds and fixed compatibility with Libtorrent 1.2.4+ in Unix versions
* Stopped fetching empty Channels from remote peers

<details>
<summary>Full changelog</summary>

* Disable video play buttons
* Add Mock in versionchecker tests
* Add timeout in async version check
* Update version check interval to six hours
* Add release url in the version check manager
* Fix RemoteQuery not using model properties
* Remove fault handler from pip3 requirements.txt
* Update run instruction in README file
* Fix Pony unique transaction error
* Using SelectorEventLoop in the Windows tests
* Fix mdblob squash test failing randomly
* Not starting libtorrent session in download tests
* Ported GUI tests to pytest
* Fix add to channel error
* Broke testnet settings into multiple ones
* Totally ignore gaierrors
* Fixed GUI test event loop policy
* Ignoring gaierror with errno -5
* Switched Win64 GUI test to SelectorEventLoop
* Updated IPv8 pointer
* Simplified Windows dev documentation
* Using SelectorEventLoop by default
* Removed too informative logging statements
* Added Windows batch script to start Tribler
* Removed cp65001 code
* Fixed SHOW_CONSOLE variable
* Removed built-in libraries from dependency checker
* Fixed dependency checker when starting Tribler
* Updated Windows development env docs
* Disable VLC loading
* Let unhandled_error_observer deal with gaierrors
* Check for new version immediately after starting
* Merge pull request 5487 from qstokkink/add_lt1.1.13_support
* Added libtorrent 1.1.13 support for listen_succeeded_alert
* Make GUI send last traceback on core timeout error
* Shutdown ResourceMonitor during unit tests
* Skip profiler test if Yappi is not installed
* Fix libtorrent 1.2.4+ compatibility
* Add default download path to recently used dirs cache
* Fix a minor comma issue in Debian control file
* Add build parameters on snap build script
* Made VLC a recommended dependency
* Fixed BUILD_TRIBLER_SNAP variable check
* Removed ffmpeg
* Updated Linux requirements
* Updated Debian building documentation
* Added more info to OverflowError
* Updated IPv8 pointer
* Removed unicode string prefix from TriblerTunnelCommunity
* Remove introduction point circuits from slots
* Update IPv8 pointer
* Fix gossiping zero-sized channels
* Merge pull request 5448 from devos50/shutdown_bootstrap
* Shutting down Bootstrap before IPv8
* Fix wrong table update
* Ask user for channel name on creation
* Workaround for channels table racecon
* Fix channels table uid remapping on removal
* Fix error on adding magnet to collection
* Fix wrong index in tablecontentmodel
* Fix double model reset
* Fixed loading VLC libraries on Windows
* Update snap base to core20 from core18
* Added fix for tribler.spec with latest setuptools
* Merge pull request 5423 from egbertbouman/various_fixes
* Fix TorrentDef.get_files_with_length
* Make debug panel work with latest IPv8
* Speedup tunnel tests + remove tests that check for tunnels not working
* Show task name when event loop is dirty
* Fix RESTManager shutdown
* Fix UDPTracker and fix test_check_torrent_health
* Fix loops and extra lines in trust balance graph
* Period tracker check changes
* Updated IPv8 pointer
* Delaying video player initialization
* Removed Twisted tutorial
* Removed Python 2.7 pyinstaller support
* Fixed test_error_observer_ignored_error
* Fixed peer count limit for RemoteQueryCommunity in debug panel
* Pathlib fix for profiler endpoint
* Handle CancelledError in download_channel
* Don't wait for the DHT while doing tunnel tests
* Fix TorrentDef.get_name_as_unicode


</details>

This minor release fixes a bug where Tribler would crash or refuse to start when logging non-UTF8 characters.

**Changelog:**
- Fixed a bug where Tribler would crash or not startup when logging non-UTF8 characters.

This release features a major refactor of Tribler Core for stability and performance and adds support for creating multiple personal channels with nested folder-like structure. Below, we list all major changes to the Tribler core and user interface. A comprehensive list of all minor changes between Tribler 7.4 and 7.5 can be found in the changelog of the release candidates.

Core
* The Tribler Core is now powered by the modern Asyncio framework which improves performance, reliability and compatibility.
* REST endpoints are now based on AIOHttp framework.
* The video player is completely rewritten, improving its performance.
* Tribler channels now support multiple channels per user with file-tree like nested structure.
* DHT requests are now anonymous by default.
* Improved the startup time of the core.
* Discovering the first Tribler channels on new installations is now much faster.
* The integrated market is disabled by default and can be enabled from the setting panel.
* The experimental 'Credit mining' feature is removed completely.

User Interface
* The home screen is removed; instead, Tribler now first shows the discovered channels.
* The torrent metainfo is loaded directly from DHT/tracker when unchecking the "anonymous" checkbox.
* The CPU-hungry animation of "loading" channel state is replaced with a static icon.
* You can now refresh the current page by clicking the selected button in the left menu again.
* Numerous small Channels GUI improvements.

Known issues:
* The 32-bit Windows version of Tribler lacks some VLC codecs.
* A newly subscribed channel is not immediately shown in the "Subscribed" list when the user subscribes to a channel. A workaround is to click on the "Subscribed" button an additional time to force refresh the list.


**Attention, owners of big channels!**
Previous versions of Tribler (7.3+) contained a bug that could have resulted in the corruption of the personal channel torrent. This release fixes the bug, and will automatically re-commit the channel in case it was corrupted. However, if your channel is very big, Tribler will appear stuck for a long time. We apologize for the inconvenience.

This is the sixth release candidate for Tribler 7.5 series. It features numerous bugfixes and some minor usability improvements over 7.5-rc5.

Attention, owners of big channels! Previous versions of Tribler (7.3+) contained a bug that could have resulted in the corruption of the personal channel torrent. This release fixes the bug, and will automatically re-commit the channel in case it was corrupted. However, if your channel is very big, Tribler will appear stuck for a long time. We apologize for the inconvenience.

* Fix InvalidStateError in UdpSocketManager
* Disable BTC wallet
* Fix iteration on keys in request manager
* Fix race condition in subscription widget
* Refactored subprocess to QProcess
* Fixed dht_pkt_alert processing
* Increase channel regen timeout in accord with DHT wait
* Fix debug window crashing on memory history plot
* Fix losing trackers when adding by magnet
* Fix DHTHealthManager
* Update IPv8 pointer
* Change limits for DHT peer count
* Added DHT buckets tab to debug panel
* Added PingChurn strategy to DHTDiscoveryCommunity
* Fix flooding DHT with bursts of requests
* Do not reset channel view on tab switch
* Fix creating torrents outside a channel
* Remove unused files
* Stop notifiying the GUI on channel downloads finished
* Cache get_channel_name results
* Remove CreditMining feature
* Fix GUI tests
* Don't show circuit flags if not ready
* Exchange intro request/response with all peers in the TunnelCommunity
* Update IPv8 pointer
* Improve tunnel debug panel
* Define default downloads dir value
* Fix test_select_download_file
* Updated AnyDex pointer
* Fix exporting libtorrent stats
* Fix unicode error in peer_info
* Regenerate broken channel torrents on startup
* Fix channel corruption by delete entries
* Fix checkpoint upgrade
* Fix recheck after updating hop count
* Reuse DHT metainfo when downloading channels
* Updating items label when receiving new channels
* Hiding 'Complete' label in GUI
* Remove download option appearing on channel entries

This is the fifth release candidate of Tribler 7.5.0 series.

**Changelog:**
- Improved the metainfo lookup of channel torrents.
- Fixed a bug where the sorting of column did not revert to their original state.
- Fixed a bug when removing a circuit.
- Loading metainfo directly when the unchecking 'anonymous' checkbox.