This reverts commit 3bb450244fda8c2e7050e44e8a392960ef63f02f.
PhpStorm you lying piece of shit... you only showed me the usages in Level!
This change should be revised and redone later.
chunkloader ID is completely unnecessary extra complication. spl_object_hash() would be fine for this as well, but a number is better. Since it's unique for the object lifetime (and the Level keeps a ref to loaders) this system should work just fine.
