Each OS publishes Batocera's systems dict (knulli-systems, and
batocera-systems at AmberELEC's newest prerelease commit and EmuELEC v4.8),
read with the shared parser. Cores come from each OS's own ES list.
AmberELEC and EmuELEC declare neogeo/ and ports/ beside bios/ from
/storage/roms, so their packs extract there and core_destination puts
core files under bios/.
Aliases equal to a name a platform launcher chooses were read in each emulator's code at its pin. Removed where the code opens no such name: xemu Complex_4627v1.03.bin (the core offers Complex_4627_v1.03.bin), mednafen gecard.pce, dosbox bios.rom, raze Roland_SC-55.sf2, nine DraStic names, and clk's upper-case MSX names, whose paths now read msx.rom, msx2.rom and msx2ext.rom as ROMCatalogue.cpp:777-841 names them. Kept aliases now name the code list they come from in the entry note.