Update libretro repositories to point to new repository
Remove Game API backwards-compatibility (no Game API v1.0.0 exists)
Build library path in CAddon instead of CAddonDll
Add new add-on type "shared library" for binary (non-python) libraries
Change library.xbmc.libretro to new add-on type "xbmc.shared-library" and check for this dependency instead of xbmc.game v1.0.0 for determining libretro compatibility
Add libretro OSX64 repo add-on