Remove appveyor

[pfultz2]

No description provided.

[firewave]

It fails without the file - that's what I meant with "keep the configuration" (similar to Travis). We (rather Daniel) just need to disable this repository in Appveyor itself and that job should just go away.

[firewave]

We also need to adjust the readme.md to reflect the (supposedly) supported minimum Visual Studio version if we keep that code.

[danmar]

It fails without the file - that's what I meant with "keep the configuration" (similar to Travis). We (rather Daniel) just need to disable this repository in Appveyor itself and that job should just go away.

I have configured "Skip branch if there is no appveyor.yml" in appveyor settings. So as I understand it we can keep the project for a little while but it will not run without this file.

[danmar]

The "Skip branch if there is no appveyor.yml" did not seem to work well so I removed our appveyor project.

[firewave]

The "Skip branch if there is no appveyor.yml" did not seem to work well so I removed our appveyor project.

Thanks.

I checked the file and it seems we already moved everything to GitHub actions so it was just testing additional Qt versions and Visual Studio Toolsets. The Qt builds will be addressed with the tooling re-definition and CI improvements. I will also look into testing other Visual Studio toolsets. So this can actually be merged.