Net Server: Verify password in Authenticate

Follows 1a8de6d2b8.
Validate the password when a client joins a game, so even a player that
knows the connection data cannot join.

Refs #3556, Refs #5913

Differential Revision: https://code.wildfiregames.com/D3438
This was SVN commit r24775.

source/network/NetClient.h

@@ -99,6 +99,11 @@ public:
 	 */
 	void SetHostingPlayerName(const CStr& hostingPlayerName);
 
+	/**
+	 * Set the game password.
+	 */
+	void SetGamePassword(const CStr& hashedPassword);
+
 	/**
 	 * Returns the GUID of the local client.
 	 * Used for distinguishing observers.
@@ -293,6 +298,11 @@ private:
 	u16 m_ServerPort;
 	bool m_UseSTUN;
 
+	/**
+	 * Password to join the game.
+	 */
+	CStr m_Password;
+
 	/// Current network session (or NULL if not connected)
 	CNetClientSession* m_Session;