Visual studio 2019 support

[viveknatarajan]

Please add support for Visual Studio 2019.

[noquierouser]

I managed to compile an updated version with the following:

• Clone the repo.
• Open vsXen/vsXen.sln in Visual Studio 2019.
• Follow the indications from this blog post.
• In the project Properties, change destination platform to .NET Framework 4.6 or greater.
• Next, open the NuGet Package Manager and update all the packages. Pay close attention to the output, because some dependencies require to install new packages.
• Check that all your References are met and you have no packages missing.
• Once all of that is fine, compile the extension.

Now, this doesn't guarantee that the extension will work at all. In fact, after installing it and trying to use it, it crashed VS2019 completely, so you're on your own.

[daxpandhi]

Apologies for not being being on top of this project for a VERY long time. I'll be fixing a few things, and re-releasing it for VS2019 this weekend. Thanks!