We've seen multiple cases where DrawableHitObject are stuck in the lifetime management container
due to not implementing a judgement (meaning they are never "hit" or "missed"). To avoid this going forward
CreateJudgement() must be implemented and return a non-null judgement.
This fixes BananaShower and JuiceStreams in osu!catch.
This also makes HitObject abstract and cleans up convert HitObject implementations.
Modify TestSceneScrollingHitObjects to contain a test case that serves
as a reproduction for a visual bug in which using the overlapping scroll
algorithm results in an incorrect origin adjustment for lifetime.