Fix old style casts and implicit conversions

src/ClientHandle.h

@@ -310,7 +310,7 @@ public:  // tolua_export
 	*/
 	bool HandleHandshake        (const AString & a_Username);
 	
-	void HandleKeepAlive        (int a_KeepAliveID);
+	void HandleKeepAlive        (UInt32 a_KeepAliveID);
 	void HandleLeftClick        (int a_BlockX, int a_BlockY, int a_BlockZ, eBlockFace a_BlockFace, UInt8 a_Status);
 	
 	/** Called when the protocol receives a MC|TrSel packet, indicating that the player used a trade in
@@ -413,7 +413,7 @@ private:
 	std::chrono::steady_clock::duration m_Ping;
 
 	/** ID of the last ping request sent to the client. */
-	int m_PingID;
+	UInt32 m_PingID;
 
 	/** Time of the last ping request sent to the client. */
 	std::chrono::steady_clock::time_point m_PingStartTime;