1.6.3 - Autoplay toggles, better channel notifications

New Features

• Autoplay toggles (#26) — autoplay can now be turned off in Settings, separately for "Up Next" suggestions and for mixes/playlists. With autoplay off, playback simply stops at the end of the video

Fixes

• More reliable new-video dots (#13) — some channels never got a dot because YouTube's subscriptions feed omits part of the fresh uploads. Detection now uses a source that lists uploads in publication order, so dots no longer miss new videos. Also works in all interface languages now and respects the Show Shorts setting