Support for Visual Studio 2017

[MateuszPeczek]

Issue description:

Open Cover UI not supported in VS 2017.

Versions used:

• OpenCover exe:
• OpenCover.UI:
• MsTest/NUnit/xUnit:

[brazilbean]

From looking around, it appears that AxoCover/AxoTools wraps OpenCover and does support VS 2017.

https://github.com/axodox/AxoTools

[mrexodia]

AxoTools looks like an amazing replacement for this tool, it also includes OpenCover in the VSIX file saving you the hassle if installing that!

[maartenoosterhoff]

Unfortunately, AxoTools does not support dot-net-core yet.

[watsonsong]

@MateuszPeczek How about the plan for support 2017?