Revert "Block: Get rid of state bitmasks"

This reverts commit b7b05e729e.

Apparently this was premature, because we still need these things to deal with default state remapping.

src/pocketmine/block/Vine.php

@@ -57,6 +57,10 @@ class Vine extends Flowable{
 		$this->setFaceFromMeta($stateMeta, self::FLAG_EAST, Facing::EAST);
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1111;
+	}
+
 	private function setFaceFromMeta(int $meta, int $flag, int $face) : void{
 		if(($meta & $flag) !== 0){
 			$this->faces[$face] = true;