Use a custom ExoPlayer fork with the FLAC extension enabled. This
greatly improves the listening experience, as it enables metadata
support on OGG files and FLAC files to be played below API 27.
Brighten the dark theme somewhat. This is for two reasons:
- To make colorOnSurface stick out less like a sore thumb
- To be more in line with other material apps
- To make the dark theme differ from the black theme more
Black theme remains unchanged, so if one wants a much darker theme,
then they can use that.
