BlockEntities: Support cloning self.

src/BlockEntities/DropperEntity.cpp

@@ -10,9 +10,10 @@
 
 
 
-cDropperEntity::cDropperEntity(int a_BlockX, int a_BlockY, int a_BlockZ, cWorld * a_World) :
-	super(E_BLOCK_DROPPER, a_BlockX, a_BlockY, a_BlockZ, a_World)
+cDropperEntity::cDropperEntity(BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, int a_BlockX, int a_BlockY, int a_BlockZ, cWorld * a_World):
+	Super(a_BlockType, a_BlockMeta, a_BlockX, a_BlockY, a_BlockZ, a_World)
 {
+	ASSERT(a_BlockType == E_BLOCK_DROPPER);
 }