Improve Visual Studio builds

[fanc999-1]

Hi,

This attempts to improve the build experience on Visual Studio by:

• Using also CMake dependency names, if applicable, for dependencies where pkg-config files are not supplied (or are broken out-of-the-box) by the dependencies' Visual Studio build systems.
• Disable pdfviewer on Windows for now, since the code there need to be ported to Windows, even if one has gtk-4.x installed.
• Fix 32-bit builds linking to shared LCMS2 builds on Windows (CMS_DLL needs to be defined in this case)
• Fix up paths in the Python tests for the fonts, and GhostScript, where GhostScript is likely installed via an installer, not in /usr; so we also try to find the names of the GhostScript executable that is provided by the 32-bit and 64-bit Windows installers, and use the ICC profiles that are installed with the installer.
• Fix up a wrong function name call in capypdf.py.

With blessings, thank you!