Update framework
Add skin support for hit judgements
Fix slider circle overlays moving with the endpoints
Implement mania star difficulty calculation
Rework decoders to be more flexible
Add Mirror Mod for Mania
Update ISSUE_TEMPLATE
Fix login failure for users with no country rank
Interpolate ParallaxContainer's scale
Add drawable to display (and update) relative dates
Remove judgements when deciding a new judgement for a HitObject
Rewrite BreakOverlay to work with rewinding
Fix check against LegacyID for non-default rulesets
Make song select ensure current beatmap is always playable in the active ruleset
Closes #2148.