added a planeswalker frame trace
added some spacing between casting cost icons, like body icons
added proof-*.html to the clean list
set the textbox texture image to match the frame texture, though still flooded.  the colors aren't right, so they need to be tweaked.
when picking a ThemeColor from a mana color, select between ARTIFACT and LAND instead of blindly picking LAND
added a green and an artifact card to the test set, which now covers all the textures
added @Tests for the green and artifact cards
added ThemeColor-based @Test calls (which simply delegate to the named @Test methods) so they can be more easily targeted if you care about color instead of the card.