Feature and bugfixes [SEE DESC]

Added TNT and Hopper minecarts
Fixed piston code failing without an extension set
Repeaters are now broken
Fixed not being able to place a minecart on an activator rail
Added much needed comments on piston code
Fixed minor formatting issue

source/Items/ItemHandler.cpp

@@ -162,6 +162,8 @@ cItemHandler *cItemHandler::CreateItemHandler(int a_ItemType)
 		case E_ITEM_MINECART:
 		case E_ITEM_CHEST_MINECART:
 		case E_ITEM_FURNACE_MINECART:
+		case E_ITEM_MINECART_WITH_TNT:
+		case E_ITEM_MINECART_WITH_HOPPER:
 		{
 			return new cItemMinecartHandler(a_ItemType);
 		}