Fix ISourcedFromTouch events being blocked by LoadingLayer
Add epilepsy warning
Add more display modes for HUD overlay (hide during gameplay / hide during break)
Disable difficulty calculation for set-level difficulty icons
Reduce alloc overhead of DrawableCarouselBeatmapSet using new function-based ctor
Add beatmap set level pooling to beatmap carousel
Unfortunately required, as loadBeatmaps() refreshes the decoded beatmap with the database-stored values, which can end up overwriting the decoded ones.