Support pinning paths in the game browser.

For example, you might have games in multiple places, internal and
external storage, or a projects directory in addition to regular games,
etc.
Support extracted ISOs (for debugging) in browser.
Show the path in the game details screen.

Helps when you have 2+ isos in the same dir with different versions of the
same game, heh.  Like when hacking/translating.
Adjust some project filters.