This folder should be moved so that it is next to the game folder rather than inside it.
Subfulders here should be mounted one by one but with their full path as if they were inside the game folder.
	i.e the current "project/game/content_source/" should be moved to "project/content_source/" and subfolders like "project/content_source/map_object_painter/masks" should be mounted as if they were located in "game/content_source/map_object_painter/masks"