this fixes TNT spawning multiple entities when lit by flaming arrows.
The problem here is a bit more complex (entities aren't immediately notified when local block updates happen, so they cache stuff that becomes unusable). The simplest option would be to just lose the cache, but that would have some impacts on performance.
Barring a rethink of the block updating mechanism, this solution seems usable for now.
this commit removes the ability to replace centrally registered entity classes in favour of using constructors directly.
In future commits I may introduce a dedicated factory interface which allows an _actual_ factory pattern (e.g. factory->createArrow(world, pos, shooter, isCritical) with proper static analysability) but for now it's peripheral to my intended objective.
The purpose of this change is to facilitate untangling of NBT from entity constructors so that they can be properly created without using NBT at all, and instead use nice APIs.
Spawn eggs now support arbitrary entity creation functions like EntityFactory does, allowing much more flexibility in what can be passed to an entity's constructor (e.g. a Plugin reference can be injected by use()ing it in a closure or via traditional DI.
