Add MSVC CI using vcpkg

[JohannesLorenz]

Steps:

• [x] Wait for next vcpkg release, which will contain the MXML port - Possibly in the next days, looking at microsoft/vcpkg#46371 (credits go to Rossmaxx from LMMS)
• [ ] Fix all warnings (-Wall not yet required)
• [ ] Enable CI (which has already been prepared at .github/workflows/ccpp.yml)
• [ ] Submit IWYU PR
• [ ] Possible extension: build nightly installer - see #340