LoadTrack
BaseDifficulty
Difficulty
RulesetInfo
DifficultyCalculator
IWorkingBeatmap
GetSkin()
GetStream
This is necessary to obtain the filesize of the audio and background files.
Prevents potential multiple evaluations of enumerable.
also fix Author showing when not wanted
This is important when using dynamic compiling to rapidly iterate. Until we actually split projects out into pieces (like the abstract ruleset project we have talked about) there is no advantage to using internal in the osu! game code.
Fixes https://github.com/ppy/osu/issues/476.