front: Peel settings submenu off as a separate activity for version 3.

In version 3 the front menu will be replaced, and it will be easier to
work with global vs. game-specific settings if they are separate activ-
ities.
cleanup: Rename video settings activity class (no functional changes).

For consistency with other settings activities.
front: Fix reference to video default settings.
front: Give the SharedPreference object member scope.

This will be more important later when we're not using the default
shared preferences (i.e. game-specific preference file).
front: Reset video preferences when other prefs are reset.
front: Fill in missing defaults in "main" activity, not sub-activity.

Guarantees the defaults are written to the preferences file before the
game is started the first time.
front: Remove some logcat spam.

These exceptions aren't that exceptional and nothing to be alarmed
about in most cases.  So down it down a bit.
front: Move front menu items up to the action bar.

Should make it a little easier to start working on the version 3 front
screen (carousel/gallery).