Conflicts: osu.Game.Modes.Taiko/osu.Game.Modes.Taiko.csproj
Gets ArchiveReader out of WorkingBeatmap and delegates extracting stuff from it to subclasses. Should enable us to make an OnlineWorkingBeatmap or so.
Subtle but looks good imo (checked with flyte).
# Conflicts: # osu.Desktop.VisualTests/Tests/TestCaseTabControl.cs