Merge pull request #96 from sergiobenrocha2/master

info files: dsp1 --> dsp1b in firmware2_* in all bsnes, utf8 in hatari, ...
Fetches common-shaders and common-overlays inside RetroArch dir
now with libretro-fetch.sh
Add fetch_subproject/fetch_subprojects to libretro-fetch.sh -
also add retroarch-assets fetching
Fetch retroarch-joypad-autoconfig to retroarch/media/autoconfig
Added authors, license and fix name in core info.