Changes to libretro core from libretro-v2.8.0.1: - group core settings per category - add timing settings group - add auto performance tuner - add frameskip options - add sample rate setting - add framerate cap setting - add framerate reduction setting - add auto setup for extra/theme folders - add osd_notification - add PSVita build - sync libretro-common and libretro-deps - fix close content from quick menu - fix core reset feature - improve debug logging - remove need to restart to enable settings - rework core timing - rework audio buffer - migrate core options to v2 - improve engines selection script