this fixes bugs where the entity would jump in the air when walking on blocks like carpet. It also fixes a lot of the issues with stepping in the anti-cheat, allowing to reduce the error tolerance on movement processing.
this was causing the movement anti-cheat to shit itself after the first movement because it used setPosition() on the player if the position wasn't exactly perfect (which obviously it never is perfect, because of fp rounding errors).
since the removal of EntityFactory::create() this isn't needed anymore, since these creation functions are only used for creating entities loaded from disk.
this bug became painfully obvious when testing bamboo. Detonating TNT near tall bamboo canes would result in bamboo canes not deleting themselves in some circumstances, because the non-destroyed parts of the cane would be updated before their supporting block was deleted, and subsequently would not be re-updated afterwards.
I think this bug should also reproduce with cacti, but I have not tested.
this version doesn't change any packets as far as I know, but it does change some packet content (most notably, some blockstates changed, which are troublesome when not in sync).
this allows generating a docblock / code for a registry without the class needing to exist or be populated yet, which makes code generation significantly less cumbersome.
fixes#3655, fixes#3241
instead of guessing where the end of the transaction is, we attempt validation after every piece of the transaction, with the assumption being that a crafting transaction will not validate until it's complete.
this will be needed for more than just this little check once item NBT gets cleaned out properly, since we'll need to compare object equality by network layer stuff instead of internals (where different network objects might deserialize to the same internal items).
