Add MSVC CI

[learn-more]

Both a 'default' build, and with the define INCLUDE_ALL set will be built. I did not know how to unroll the individual build steps (without making it a huge matrix, where each build will do a new checkout), so all build steps are copy-pasted manually.

[dumblob]

I did not know how to unroll the individual build steps (without making it a huge matrix, where each build will do a new checkout), so all build steps are copy-pasted manually.

I think your approach is totally OK - it is explicit and IMHO not that verbose and allows for quick commenting out things etc.

[learn-more]

@dumblob is there anything I can do to get this merged?