Make use of GitVersion to detect version

[mkevenaar]

[AdmiringWorm]

If you plan to use GitVersion, I would recommend installing and using it through a tool-manifest file.

This can be easily set up running the following commands:

dotnet new tool-manifest
dotnet tool install GitVersion.Tool

Then commit the file .config/dotnet-tools.json to the repository.

When the tool is meant to be used,
you could then call

dotnet tool restore # Will restore all tools mentioned in the tool manifest
dotnet gitversion

The same thing could then be used with GitReleaseManager (#29) as well.

NOTE: Do not work with cake, if it is planned to use that