Fine-tuning CardsUI

Reduced overdraw by removing window background on CardsUI activity.
Moving more into styles.  Getting ready to migrate PersonalActivity to
CardsUI.
PersonalActivity + CardsUI!

PersonalActivity now using CardsUI for the whole thing.  Sharing is
working on both the normal cards and the graph cards.  Tweaked
margins/etc some more.  Can't seem to use margins on the bottom of
Shareable/Title Card, so I used padding.  It was a sad day.