This reverts commit 6f2cc5471a and also its testing cases.
This became dead code after actual correct osu!catch skin colouring, we don't support modern skinning (non-legacy skinning) at the moment, so for what it's worth this can be reverted to default red-coloured
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.