GetPathForFile
BeatmapSetInfo
This is used in several places, and so should probably have a function rather than remaining as duplicated code. Also applies this together with the previous commit to `BeatmapManagerWorkingBeatmap`.
GetStream
IWorkingBeatmap
This is necessary to obtain the filesize of the audio and background files.
Migrate all usages of StreamReader in the context of decoding beatmaps, storyboards or skins to the new LineBufferedReader.
Also removes unnecessary background texture (the actual storyboard background spec wasn't implemented correctly anyway).