Implement osu!mania key mods
Cleanup osu!mania's RulesetContainer and Beatmap conversion process
Cleanup some possible CI errors
Not sure why these aren't being detected on master right now - they should be...
Fix slider follow circle instantly disappearing on slider ends
Permit BeatmapInfoWedge to display Unicode artist and title
Fix storyboard file paths on Linux/macOS using incorrect path separators
ScoreMultiplier not currently working - that's a more involved change that requires the aforementioned "BeatmapAttributes" changes.
Also restructures with the addition of a ManiaBeatmap which holds definitions for "groups" of columns. At the moment these are empty save for a "Column" property, but can be expanded in the future, maybe.
Change icon for audio settings
Fix errors on import
Fix song select dummy beatmap once and for all
Fix TestCasePerformancePoints binding to global beatmap
Create a LargeTextureStore for cached (but not atlased) global textures
Clearly mark unimplemented mods and make them non-selectable
and never unbinding
Extend TestCases for HitObjects