FFVS Project Generator, Harfbuzz, LibXML2 and Fontconfig updates

The Harfbuzz project was updated to version 1.5.1 and libxml2 was updated to 2.9.5. The fontconfig project was also updated to 2.12.5. The FFVS Project Generator is now at version 1.6.2 with updates that improve Visual Studio version detection, libxml2 support and autodetection of default libraries. Any projects that have a dependency that was updated has also been updated to build with the latest versions of the new libraries as well.