Build release version only

[cjee21]

Optimize the build by building release mode only (vcpkg defaults to build debug too) to reduce build time and save CPU cycles.

Also update some comments and readme text as well as point the url in readme to MediaArea repo's release.

[cjee21]

@JeromeMartinez Automated builds of Graphviz using vcpkg is here: https://github.com/cjee21/Graphviz-Windows

Compared to official Graphviz release, this one has ARM64 build, CFG enabled and is using static CRT (So no need VCruntime and UCRT dlls). Dependencies may be newer than official release too since they use pre-compiled dlls stored in Git for official Windows builds. Plugins are a little different from official release but for MediaInfo use should not matter. There may be some useless dlls included (like brotlienc.dll) that can be left out when packaging graph plugin.

The automated builds include integration test with MediaInfo to ensure graph can be generated from MediaInfo on all three architectures.