* Add con_log.c to log all console output

* Add con_passive.c to cut down on #ifdef DEDICATED in sys_main.c
* Add Sys_ErrorDialog to report ERR_FATALs to the user
  + On Windows use a MessageBox and offer to copy the console log to the
    clipboard
  + On everything else print to the terminal and save the console log as
    crashlog.txt

code/qcommon/files.c

@@ -2872,7 +2872,7 @@ static void FS_CheckPak0( void )
 		if(!fs_gamedirvar->string[0]
 		|| !Q_stricmp( fs_gamedirvar->string, BASEGAME )
 		|| !Q_stricmp( fs_gamedirvar->string, "missionpack" ))
-			Com_Error(ERR_FATAL, "\n*** you need to install Quake III Arena in order to play ***");
+			Com_Error(ERR_FATAL, "You need to install Quake III Arena in order to play");
 	}
 }