Added Stage_Song, refactored SongManager
Cleaned up stage component setup
Merge branch 'master' of SpaceUsurperUnity
Added SongTime struct
Fleshed out SongTime
Reworking SongLayer
Song scheduling rewrite mostly done
First pass at making sure the song keeps time
Music time-keeping mostly working
Trying out using a low pass filter duing slow motion
Fixed restarting song
Song playback speed matches replay playback