Changed, Directory/PK3/PK7: on second thought, we don't need to load...

Changed, Directory/PK3/PK7: on second thought, we don't need to load textures/flats from all possible locations (does anyone really needs to see sprites and graphics in the texture browser?), so this logic now only works when looking for patches.
Game Configurations: added "Custom Ambient Sound (no gravity)":14067, added a couple of missing parameters to other sound-related things.