Revert "shared_ptr -> std::shared_ptr"

This reverts commit 7074f35e4b.

Minecraft.World/SetHealthPacket.h

@@ -21,10 +21,10 @@ public:
 	virtual void handle(PacketListener *listener);
 	virtual int getEstimatedSize();
 	virtual bool canBeInvalidated();
-	virtual bool isInvalidatedBy(std::shared_ptr<Packet> packet);
+	virtual bool isInvalidatedBy(shared_ptr<Packet> packet);
 
 public:
-	static std::shared_ptr<Packet> create() { return std::shared_ptr<Packet>(new SetHealthPacket()); }
+	static shared_ptr<Packet> create() { return shared_ptr<Packet>(new SetHealthPacket()); }
 	virtual int getId() { return 8; }
 };