filesystem: massively rework how scanning game directories work

* No more conversion from liblist.gam to gameinfo.txt. We are using liblist.gam directly now.
  gameinfo.txt being native format to Xash3D not only remains, it takes priority over liblist.gam.
* Quake game directories now don't receive autogenerated gameinfo.txt.
* Empty directories don't get gameinfo.txt either, finally making it easier to support HD addon folders.
* If user still wishes to generate gameinfo.txt, there is now command fs_make_gameinfo that creates
  gameinfo.txt for currently running game.
* No more creating empty folders for RoDir. They are now created on demand.

engine/common/filesystem_engine.c

@@ -84,6 +84,11 @@ static void FS_Path_f_( void )
 	FS_Path_f();
 }
 
+static void FS_MakeGameInfo_f( void )
+{
+	g_fsapi.MakeGameInfo();
+}
+
 static const fs_interface_t fs_memfuncs =
 {
 	Con_Printf,
@@ -272,6 +277,7 @@ void FS_Init( const char *basedir )
 	Cmd_AddRestrictedCommand( "fs_rescan", FS_Rescan_f, "rescan filesystem search pathes" );
 	Cmd_AddRestrictedCommand( "fs_path", FS_Path_f_, "show filesystem search pathes" );
 	Cmd_AddRestrictedCommand( "fs_clearpaths", FS_ClearPaths_f, "clear filesystem search pathes" );
+	Cmd_AddRestrictedCommand( "fs_make_gameinfo", FS_MakeGameInfo_f, "create gameinfo.txt for current running game" );
 
 	if( !Sys_GetParmFromCmdLine( "-dll", host.gamedll ))
 		host.gamedll[0] = 0;

filesystem/dir.c

@@ -134,7 +134,7 @@ static void FS_PopulateDirEntries( dir_t *dir, const char *path )
 	}
 
 	stringlistinit( &list );
-	listdirectory( &list, path );
+	listdirectory( &list, path, false );
 	if( !list.numstrings )
 	{
 		dir->numentries = DIRENTRY_EMPTY_DIRECTORY;
@@ -225,7 +225,7 @@ static int FS_MaybeUpdateDirEntries( dir_t *dir, const char *path, const char *e
 	int ret;
 
 	stringlistinit( &list );
-	listdirectory( &list, path );
+	listdirectory( &list, path, false );
 
 	if( list.numstrings == 0 ) // empty directory
 	{
@@ -421,7 +421,7 @@ static void FS_Search_DIR( searchpath_t *search, stringlist_t *list, const char
 	}
 
 	stringlistinit( &dirlist );
-	listdirectory( &dirlist, netpath );
+	listdirectory( &dirlist, netpath, false );
 
 	Q_strncpy( temp, basepath, sizeof( temp ));