Before this change, if you wanted to include physis you had to include
a bunch of dependencies you didn't need. For example, a launcher would
have to pull in texpresso which is completely useless. By default,
the features from before (excluding game_install) are included.
Also this creates a game_install feature for eventual Windows builds,
where unshield is not supported.
Currently only the first two game patches are checked, eventually want
to check boot patching as well. Hopefully this should weed out the
remaining patching issues I encounter.
