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.
fixed bug: crash if rom card was only cart
fixed bug: when em-5 selected monitor rom wasn't paged in
brno mod: windowed boot as default rom
brno mod: fixed bug: tape command in menu now works
