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.
Comment: There are still a few issues with some games where the data might need refining. The following sets do not work, even as a 1 slot game but work as normal sets; (mt_tetri, mt_gng, mt_fwld, mt_srbb)
- SoftList is incompelte, I hate working with the XML, if somebody wants to add the remaining titles, be my guest
- SMS games have issues, the CPU isn't being properly reset (or something) when moving between games, so stick to only a single SMS game for now or the z80 will crash.
It used to work, but the code has been out of use for a while.
- syntax is MAME megatech -cart1 mt_beast -cart2 mt_soni2 -cart8 mt_shar2
