new libretro core: Atari 3D Arcade I, Robot emulator

[soundsnow]

GCA3A - Raster - Atari - MC6809E - I, Robot
This game is only supported by two emulators. Another open source emulator https://github.com/manfreda-dot-org/I-Robot-Project that has been updated from 1998 to 2024, it has a better experience on low-end devices than MAME.