ci: remove --output from dotnet pack, put output directory to Directory.Build.props

chore: use version prefix to allow for setting a version suffix

ci: add version suffix to dotnet build and nuget push

ci: fix nightly pack

ci: add nightly nuget push to myget

Merge pull request #54 from Rutherther/test/packet-files

Add tests working with packet files

chore: filter out NosSmooth.Game.Tests from dotnet test

CI does not contain needed NostaleData files.

chore: add ci tests