glyph images are now used as masks over the "leds_on" image
instead of the glyphs themselves looking like they're made of LEDs.
Makes font files much simpler, easier to draw, makes LEDs easier
to re-texture.
White for "on" LEDs, black for "off"
Also optimized all images (optipng, pngcrush)
(sorry, no UTF-8 here, Lue doesn't do multi-byte too well in this situation)
plus a bunch of symbols stuffed into the empty 128-159 range that should be
useful on a marquee:
128,129: musical notes
130-140: box drawing glyphs
141-144: block shades
145-152: arrows
153-156: explosion/splat
157-159: smileys
This commit changes the "all on" keyword to point to char(144), and
"cursor" is moved to char(31).
