Support Visual Studio Project Loader extension #1293
Description
We should continue to support the Visual Studio project extension as we did in TestCentric 1.X
- The user can install this extension and afterwards it's been listed in the extension dialog
- The file dialog provides a file filter for .csproj, .vbproj, etc.
- The user can select one or many of these files
- After the files are loaded, tests can be executed as usual
The VS Project loader has many limitations. The aim of this issue is to get it running under TestCentric, not to fix or improve it. If NUnit drops support for it we may consider dropping it as well.
Part of #1262