Libtorrent

* using android NDK r15c
* using -O2 for all architectures
* lt:fix to clearing of piece picker in suggest_read_cache mode
* lt:fix memory issues with listen sockets references
* lt:fix bug where the resume data would fail to load the piece bitmask for
seeds when suggest_cache was enabled
* lt:submit disk jobs in read_piece()
* lt:add reserve entry::to_string() (optimization)
* lt:refactor several flags to torrent_handle::get_flags/set_flags
* lt:added block_uploaded_alert to allow client to track upload activity
* lt:fix inconsistency in file_priorities and override_resume_data behavior
* lt:remove call _strchr (optimization)
* lt:fix bandwidth rate limit calculation
* lt:fix handling of SSL listen sockets
* lt:don't move listen_socket_t when deleting sockets
* lt:avoid executing timed async task if the dht node is already removed
* lt:reject DHT put messages with incorrect bencoding
* lt:fix backwards compatibility issue when loading the torrent info dict
from resume data
* lt:fix regression where paused torrents could not have their queue
position changed
* lt:use netlink to enumerate network interfaces on linux
* lt:fix out-of-bounds read in bdecode
* lt:fix re-check issue after move_storage
* lt:avoid runtime fail with wrong arguments in upnp::update_map
* lt:handle invalid arguments to set_piece_deadline()
* lt:fix that move_storage did not work for torrents without metadata
* lt:fix check for fully allocated file on windows
* lt:defer reconnecting peers to after the second_tick loop
* lt:implemented support for BEP 51
* lt:source code cleanup and stability

* added swig interface to announce_endpoint

* updated to OpenSSL 1.1.0f
* updated to boost 1.64
* using android NDK r15
* avoid automatic UTF-8 conversion in JNI side when using string_view
* lt:fix bandwidth rate limit calculation
* lt:fix for what appears to be an clang/llvm miscompilation
* lt:only listen on preferred IPv6 addresses on Windows
* lt:when stopping a torrent, never perform a name lookup on the tracker,
only announce to trackers whose IP we already know. This is expected to
make shutdowns not hang
* lt:fix previously faulty fix to enum_routes
* lt:delay 5 seconds before reconnecting socks5 proxy for UDP ASSOCIATE
* lt:fix NAT-PMP crash when removing a mapping at the wrong time
* lt:fix race condition in storage tick handling in disk_io_thread
* lt:keep iterating over endpoints if one is found to be done in
tracker announce loop
* lt:don't abort the existing torrent when attempting to add it again
* lt:fix IPv6 UTP assertion failure, close listen sockets after closing
all connections
* lt:fix branch factor overflow in DHT traversal algorithm
* lt:bind upnp requests to correct local address
* lt:don't combine reuseaddr and exclusive addruse on windows
* lt:save resume data when removing web seeds
* lt:fix proxying of https connections
* lt:fix race condition in disk I/O storage class
* lt:avoid extra sha1_hash memory copy in create_torrent
* lt:fix http connection timeout on multi-homed hosts
* lt:implemented multi-home support
* lt:make DHT bootstrapping more robust by not throwing away nodes
* lt:need_save_resume_data() will no longer return true every 15 minutes
* lt:create a separate DHT node for each listen socket
* lt:avoid connections to trackers when the event is stopped and
stop_tracker_timeout <= 0
* lt:fix storage destruction order issue
* lt:fix memory leak in the disk cache
* lt:magnet links: unescape hash parameter
* lt:fix double free in disk cache
* lt:fix typo in natpmp::start
* lt:remove mutex-release hack in file_pool
* lt:source code cleanup and stability

* fixed synchronization issues in SessionManagerstop

* added support for ip_notifier in macOS
* added resolver_cache_timeout setting for internal host name resolver
* improved public API
* internal fixes in libtorrent

* start of changelog