- Change runtime standalone detection:

* com_standalone now read-only
  * add new cvars com_basegame, com_homepath
  * standalone now automatically detected when com_basegame is set to something different than baseq3 and no id pak pk3s are found
  * This fixes https://bugzilla.icculus.org/show_bug.cgi?id=4699
- Replace a few hardcoded string literals with macros
- Add checks for Team Arena PK3s to FS_CheckPak0()

code/server/sv_ccmds.c

@@ -1279,7 +1279,7 @@ void SV_AddOperatorCommands( void ) {
 	Cmd_AddCommand ("heartbeat", SV_Heartbeat_f);
 	Cmd_AddCommand ("kick", SV_Kick_f);
 #ifndef STANDALONE
-	if(!Cvar_VariableIntegerValue("com_standalone"))
+	if(!com_standalone->integer)
 	{
 		Cmd_AddCommand ("banUser", SV_Ban_f);
 		Cmd_AddCommand ("banClient", SV_BanNum_f);