Read meta data from libretro-super

[fetzerch]

Libretro maintains metadata files with better description compared to what we get from the libs:
https://github.com/libretro/libretro-super/blob/master/dist/info/bsnes_accuracy_libretro.info

The interesting ones:

display_name = "SNES / Super Famicom (bsnes Accuracy)"
authors = "byuu"
  #supported_extensions = "sfc|smc|bml" (get from lib)
  #corename = "bsnes/higan Accuracy" (unneeded)
  #manufacturer = "Nintendo" (unneeded)
  #categories = "Emulator" (unneeded)
systemname = "Super Nintendo Entertainment System"
  #database = "Nintendo - Super Nintendo Entertainment System|Nintendo - Sufami Turbo"
license = "GPLv3"
  #permissions = "" (unneeded)
  #display_version = "v094 (Accuracy)" (get from lib)
  #supports_no_game = "false" (get from lib)