IBeatmap
The working beatmap is now in the context, so it's easier to distinguish beatmap type, hence no need for this prefix.
IWorkingBeatmap
BeatmapVerifierContext
This simplifies passing of contextual information by enabling addition without needing to refactor lots of classes. See next commit for example.
ControlPointInfo
Makes more sense, as this is typically the result of timing changes.
CheckUnsnaps
CheckUnsnappedObjects
Will potentially have `CheckUnsnappedKiai` or similar later, so this is worth specifying. Also consistent with `CheckConcurrentObjects`, which will likely have a `CheckConcurrentLines` later.