For all manually-created images PNG have been kept.
- rename all icon attrs to have a `ic_` prefix
- always use `_24dp` icons, because there is no real difference, since they are vector drawables
- always use the original name found on material.io for icon drawables, as to not create confusion and possibly duplicates. Icon names can still be different from real drawable names, though I have made some of them compliant to this or maybe more meaningul.
- remove duplicate `getIconByAttr()` in ThemeHelper (use `resolveResourceIdFromAttr()`
- use standard icons for `expand_more` and `expand_less` instead of triangles
- use `play_button_outline` instead of custom PNG as play button in VideoDetailFragment (questionable, as there is no shadow anymore)
-Added info item menu with custom title banner on long click.
-Enabled starting playlists and channels from middle.
-Enabled caching for play queue item thumbnails.
-Modified play queue to revert to first item on deleting last item.
-Added selected item bullet.
-Modified play queue panel darker on main video player.
-Fixed color issue on play queue panel on light-themed main video player.
-Fixed hold-to-enqueue tooltip flashing when clicked on earlier sdk versions.
-Fixed queue item removal causing metadata for currently playing to refresh.
-Renamed refactor directory in player to helper.
-Fixed background player notification update causing lag on older spec models.
-Fixed service activity theme not changing after user setting is changed.
-Fixed NPE on popup player fling to close.
-Fixed audio reactor volume and max volume mixup.
-Added correct toast for each player error case.
-Fixed button coloring for play queue service activity on landscape.
-Changed title and uploader text to marquee for vertical service activity.
-Removed cache clearing on every thumbnail load.
-Added icons for shuffle and drag handle.
-Fixed exception when returning to background player activity after service shuts down.
-Fixed open detail only working for Youtube.
- Added remove and open detail as long click popup dropdown on background player.
- Vastly simplified list manipulation in MediaSourceManager by delegating most control to DynamicConcatenatingMediaSource.
- Fixed media source resolution on background player for streams without an audio only stream.
- Fixed background player not updating when screen turns back on.
- Fixed background player notification switching to wrong repeat mode icon opacity on click.
