plugin devs can't be relied on to pass the proper types to these APIs, and when the wrong types get passed it makes type errors appear from inside the internals.
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.
this allows doing stuff like injecting plugin references to entity constructors for now. I want to make this more flexible still, but I've done about as much as I feel like doing today and don't want this disappearing into a stash to never be seen again.
* Utils: fix parsing of single-line doc comments, closes#3388
* correctly handle the empty doc-comment case, add another test case
* ignore an extra phpstan bug
this isn't required by the spec and PHPStan chokes on it. I was previously having it ignore these errors, but it turns out that PHPStan is not making use of extended typeinfo provided if it can't parse the tag, which is problematic on level 6 and also a problem for array-of-type. Therefore, we are going to have to take the hit.
