Änderungen

Summary

1. Remove unitrecycler, use unitindexer, make gravity configurable per entity (details)

Commit 55d09e282d4e081e0fb2b2d94998154a15adb94d by frotty Remove unitrecycler, use unitindexer, make gravity configurable per entity
	wurst/physics/PhysicsEntity.wurst (diff)
	wurst/entity/Event.wurst (diff)
	wurst/entity/TextTagEntity.wurst (diff)
	wurst/entity/UnitRecycler.wurst
	wurst/entity/Entity.wurst (diff)
	wurst/physics/PhysicsConstants.wurst (diff)