Revert "shared_ptr -> std::shared_ptr"

This reverts commit 7074f35e4b.

Minecraft.World/TreeTileItem.h

@@ -3,7 +3,7 @@ using namespace std;
 
 #include "TileItem.h"
 
-class TreeTileItem : public TileItem
+class TreeTileItem : public TileItem 
 {
 private:
 	Tile *parentTile;
@@ -14,5 +14,5 @@ public:
 	virtual Icon *getIcon(int itemAuxValue);
 	virtual int getLevelDataForAuxValue(int auxValue);
 
-	virtual unsigned int getDescriptionId(std::shared_ptr<ItemInstance> instance);
+	virtual unsigned int getDescriptionId(shared_ptr<ItemInstance> instance);
 };