Twitch-archiver

**Changes and Fixes:**
* Fix downloading of VODs with titles containing `!` on Linux (https://github.com/Brisppy/twitch-archiver/issues/33).

**Changes and Fixes:**
* Fix issue with fetching VOD access tokens.
* Fix failing tests.

**Changes and Fixes:**
* Fix error logging when downloading stream segments or fetching stream parts fails.
* Fix issues with fetching stream parts for newly live streams.

**Changes and Fixes:**
* Fix downloaded thumbnails being very low resolution.
* Raise temporary buffer before archiving to reduce chance for the paired stream VOD being missed.
* Bump required Python version (3.7 -> 3.9).
* Fix docker build failing due to outdated Python version (https://github.com/Brisppy/twitch-archiver/pull/32 - Thanks helmut1337).

**Additions**
* Add ability to change temporary download directory via the environment variable `TWITCH_ARCHIVER_TMP_DIR`.

**Changes and Fixes:**
* Optimized imports.
* Fix test for `get_vod_owner()`
* Fix real-time archiver failing to exit on some exception.
* Fix fetching latest video if running in `live-only` mode.

**Changes and Fixes:**
* Add retrying to all API functions.
* Reduce processing time for channel videos when running in `live-only` mode.
* Fix issues with retry loop in stream downloader not functioning (https://github.com/Brisppy/twitch-archiver/issues/29).
* Add catch and unsupported log message for highlight videos.