- Switch master server protocol to dpmaster for better game separation. Based partly on patch by Zack Middleton

- Get rid of ugly cvars sv_heartbeat and cl_gamename and replace with single com_gamename
- Remove sv_flatline. Flatlines are ignored by dpmaster and are considered to be insecure because flatlines can be udp-spoofed.

code/qcommon/qcommon.h

@@ -870,6 +870,7 @@ extern	cvar_t	*sv_paused;
 extern	cvar_t	*cl_packetdelay;
 extern	cvar_t	*sv_packetdelay;
 
+extern	cvar_t	*com_gamename;
 extern	cvar_t	*com_protocol;
 #ifdef LEGACY_PROTOCOL
 extern	cvar_t	*com_legacyprotocol;