Text style tweaks.
Track game history, add history screen.
Revamped scale handling, scrolling.

Also added auto-scroll to each scoring hand while reporting it.
Some history screen polish.
UI layout tweaks.
Various polish.

- slide card into place on play
- fade legal moves out during score animations
- fade legal moves back in only when it's our turn again
New iOS splash screens.

Old ones were cut off.

Unrelated note. I switched from Gimp to PixelMator and was more productive with
the latter than the former in about 180 seconds. Go OSS.
Slurp all assets from assets dir.
Use smiley images instead of font glyphs.

Fucking fonts are unpredictable. Obviously related characters are wildy
different sizes (in the same typeface and point size) and positioned
differently in the "frame". And on iOS the smiley is emoticonized and the frown
is not. Font fail!
Use a pair of flickers for ballistic scrolling.
Score color/size tweaks.