Taiko scoreprocessing
I think this is an okay compromise because hp_hit_great doesn't use linear interpolation here. I am tentative on this change, but I need to code up the rest of taiko before I can test this further.
Add DrumRoll tick judgement info.
Song select improvements
ParallaxContainer should always know the mouse position.
Conflicts: osu.Game.Modes.Taiko/TaikoScoreProcessor.cs