Fontconfig, gcrypt and libass updates

The fontconfig library was updated to version 2.12.2 and then a quick update to 2.12.3. The libgcrypt library was updated to 1.7.7 and libass was also updated to 0.13.7. As always the latest releases are available on the Projects page while still allowing access to any previously supported releases. The latest FFmpeg build has also been updated to use the latest versions of the new libraries as well.