Cut powerup prices

Bring them more in line with the effort to earn the winks.
New Backgrounds

Plus some alignment fixes...
New Standard Achievements

Making it a little bit easier to unlock that first deck...
Categorize Backgrounds
Highlight backgrounds

Blue for the current one, white for other purchased ones.
Revamp Deck Gallery

Mimic the Up Your Sleeve selection screen, with deep red indicating a
removed card.
Kisses Screen

.. with simple choice of Decks or Backgrounds...
Merge pull request #58 from SariniLynn/develop

Third Alpha, closes #56