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

Libretro core merged to upstream.
Changes from legacy libretro core (based on ScummVM 2.1.1):
- massive cleanup/fix/refactor/improvement of makefiles and build scripts
- fix wiiu build
- fix 3ds build and add 'highres' engines
- add win32 support
- add support for mouse relative movement (e.g. Myst 3)
- add cloud feature support (system shared libcurl needed)
- add support to select system shared dependencies at build time
- add core reset function
- add games preliminary checks before being loaded in ScummVM
- fix crash for games/scummvm files not recognized in ScummVM
- add italian translation
- increase gamepad cursor speed reduction while pushing R2
- added virtual keyboard feature
- added D-pad cursor acceleration time setting