install/games/ was last written before 7035da115 and 801af113b changed
the rom folders files (offers, searched_by) and before this branch's
profile and collection changes: test_published_files_are_current failed.
generate_games_index rewrites 37 files, setups and fallbacks. The
arcade indexes do not change, clone parents staying out of them.
muOS names its GBA folder gameboyadvance first, which resolved to ares's
game-boy-advance. mgba lists nintendo-gba, so the fallback set was empty
and an unrecognised GBA game got no file. ares, dgen, picodrive, fbneo,
fbalpha2019 and emux_sms now use the ids the other profiles use, with
their old spellings kept as SYSTEM_ALIASES (bios.sms and fbneo's
Spectrum sets had fallen to the other bucket of the RetroArch list).
A folder whose name spells a machine its core does not run now also
holds the core's machines: a PC Engine CD folder run by mednafen_pce_fast
got no System Card. Install lists and install/games regenerated.