Improved command blocks

* Their command and previous output are displayed on the client
* They have a BlockHandler implementation, so you can't place blocks on
them anymore
+ As a side effect, implemented UpdateBlockEntity

src/Blocks/BlockCommandBlock.h

@@ -0,0 +1,32 @@
+
+#pragma once
+
+#include "BlockEntity.h"
+
+
+
+
+
+class cBlockCommandBlockHandler :
+	public cBlockEntityHandler
+{
+public:
+	cBlockCommandBlockHandler(BLOCKTYPE a_BlockType)
+		: cBlockEntityHandler(a_BlockType)
+	{
+	}
+
+	virtual void ConvertToPickups(cItems & a_Pickups, NIBBLETYPE a_BlockMeta) override
+	{
+		a_Pickups.push_back(cItem(E_BLOCK_AIR, 8, 0));
+	}
+
+	virtual const char * GetStepSound(void) override
+	{
+		return "step.stone";
+	}
+} ;
+
+
+
+