Streamlink Twitch GUI

Replaced buttons for following and subscribing channels (#813)
Twitch has decided to shut down the follow-channel API endpoints, which means that 3rd party applications using their public APIs won't be able to follow or unfollow channels anymore. As a workaround, the buttons have been replaced with one that opens the channel page on Twitch.tv in the system's web browser.
Please see the comment on issue #813 and the commit message of 402cab1 for all the details and how you can help make Twitch restore this feature again via their feedback tracker. Thank you!
Added chat profile for Chatterino (#607)
Added --no-keepaspect-window to MPV player profile
Added support for more TLDs to the linkparser
Added platform details to about page (#770)
Changed log dir on Linux according to new XDG-base-dir spec version 0.8
Fixed header text length in modal dialogs
Fixed being able to stack multiple quit dialogs
Fixed context menu on documentation links
Fixed Windows uninstaller not removing some files
Removed MSIE chat profile
Upgraded snoretoast (Windows notification provider) to 0.7.0
Upgraded NW.js to 0.52.2 (Chromium 89.0.4389.114 / NodeJS 15.12.0)
Upgraded Linux AppImage (#798)
[dev] Upgraded from webpack 4 to webpack 5 (#803, #812)
[dev] Upgraded from ember-i18n to ember-intl (new translation formats) (#806)

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