Get rid of a couple of copies of the CC0 text. Add header comment to
CC0 files to remind people editing them what the terms are. Also add
some missing XML headers. The header comments in layouts won't bloat
the binary - they get stripped out before compressing, same as any other
comments.
The CPU tries to read data in a tight loop, so there must be
some way for it to be halted until data is ready. The current
solution works good enough to boot CP/M.
Also:
- Change FDC to KR1818VG93
- Change disk format from 3.5" to 5.25"
- Add single sided disk format
- Add softlist
