Removed entanglement between chunks and providers. WARNING: BREAKING API CHANGES.

- All entity and tile constructors now require a \pocketmine\level\Level instead of a \pocketmine\level\format\Chunk.
- Chunk->getProvider() and Chunk->setProvider() have been removed.
- Chunk::__construct() has had the $provider parameter removed.
- Chunk->unload() has had the unused $save parameter removed.
- ChunkEvents now take a Level parameter instead of going through the Chunk

API bump to 3.0.0-ALPHA4

src/pocketmine/block/EnchantingTable.php

@@ -57,7 +57,7 @@ class EnchantingTable extends Transparent{
 			}
 		}
 
-		Tile::createTile(Tile::ENCHANT_TABLE, $this->getLevel()->getChunk($this->x >> 4, $this->z >> 4), $nbt);
+		Tile::createTile(Tile::ENCHANT_TABLE, $this->getLevel(), $nbt);
 
 		return true;
 	}