This improves ttf-convert slightly:
- variable size glyphs
- initialize metrics for glyphs with zero-size bitmaps (e.g "space")
- move the font/serialization structures to a common header
The keyboard example includes keyboard layout data for the HSS-0129 (Japanese)
Sega Saturn keyboard.
I'd like to include bits of libgcc piecemeal--I don't want to "accidentally"
start depending on libgcc bits that I'm not aware of.
Reworked division so that it uses the on-chip division register.
