Emulator selection for ARCADE romset

[ljhmd0825]

Arcade, Fbneo, CPS1,2,3, NeoGeo, MAME related Since these systems use various romset versions, AmberElec and ArkOS provide a variety of cores and emulators to choose from. It would be nice to be able to select various MAME cores(ex: mame2003plus, mame2010, mame current) and fbneo, fba cores, mame4droid app in each system. For brevity, including only Retroarch 64 seems like a good choice. Thanks always for developing a good frontend.