Clear hedgehog's gear Power value when switching. Should fix
issue #446 (not tested, but looks obvious).
This should cover all entries from
issue #438
fix for
issue #441 ("Cannot overwrite default weapon set 'Default'!" message when no change to weapon set was made)
Set minimums on a few values to avoid camera zooming out past them. partly
issue #430. Might be worth defining a new constant for this.