Improve setup.py installation on Windows

[danielpieczko]

For Linux and Mac, a pip install of xscope_fileio will build the host endpoint in the host directory so it is ready to use.

For a general Windows system, we can't assume a particular build command because there are multiple options (for example: just nmake, or create a whole VisualStudio project?)

Currently setup.py skips the build commands on Windows, but it would be nicer to do something more useful like check if the endpoint is present and display a warning to say that it needs to be built manually in the correct directory.

[xhuw]

with visual studio C++ toolchain installed and fair bit of googling I found the cmake incantation. needed to specify win32 as XTC seems to ship with a x86 version of the fileio lib

cd host
cmake -B build -A Win32
cmake --build build --config Release

Then the host app can be found in host\build\Release

here's one I made earlier

edit: I used the "Visual Studio 17 2022" generator. Didn't manage to make ninja work