Migrate to SLNX

[slozier]

SLNX has been stable since 16.14 so we should be able to switch.

Resolves #1933

[BCSharp]

There is also _ctypes_test.sln in the repo but I guess we want to keep it as .sln? (I never used it, always use the Makefile).

[slozier]

There is also _ctypes_test.sln in the repo but I guess we want to keep it as .sln? (I never used it, always use the Makefile).

Good catch. I don't recall the last time I looked in that folder! 😄

[BCSharp]

It escaped my attention the first time I looked at it, but since then I've noticed that some solution items refer to nonexistent files and trying to open them (double-click) results in an error.. @slozier, was/is it your plan to check them in to the repository?

[slozier]

It escaped my attention the first time I looked at it, but since then I've noticed that some solution items refer to nonexistent files and trying to open them (double-click) results in an error.. @slozier, was/is it your plan to check them in to the repository?

Hmm, must be remnants of the past that were in the old solution file. Will see if I can remove the dead entries this evening.