The motivation for this is to prevent passing a dynamic argument to cancellation, which in almost all cases is a bug in user code. This same mistake also appears in a few places in the PM core (as seen in this commit), but in those cases the mistakes were mostly harmless since they were taking place before the event was actually called.
closes#3836
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.
