Both branches extracted RetroBat's Flycast BiosPath: value_folders
already produces the record, so the dedicated extractor is dropped and
its test reads the generic one.
RetroArch_installCores (emuDeckRetroArch.sh) downloads flycast, mame,
melonds, mgba, mupen64plus_next, ppsspp and scummvm as libretro cores
next to their standalone apps. Listed as standalone only, they got one
layout: once Flycast's standalone files moved to flycast/bios/, the
libretro core lost dc/airlbios.zip, dc/naomi2.zip and dc/segasp.zip.
The scraper now writes them as dual_mode_cores.
standalone_path is relative to the directories a standalone build
resolves it against, now declared per profile (standalone_directories).
A launcher record that links or passes a whole folder of the BIOS tree
under one of them gives that folder, and platform_layouts rebases the
standalone view once for the builder, the manifest, verify and slots
(launchers.standalone_root, common.standalone_destination).
Flycast on RetroPie and ROCKNIX reads bios/dc, on EmuDeck
bios/flycast/bios, on Batocera (FLYCAST_BIOS_PATH) and RetroBat
(Dreamcast.BiosPath) bios/dc. The ROCKNIX, Batocera and RetroBat
scrapers now record the patched data directory, the environment
variable and the setting that say so.