Complete integration of NuGet package

- Updated NuGet package reference, removed references to local/external AGauge project
- Updating Setup project with changes in references as a result
- Removed AGaugeTest form
- Removed extra .NET publishing dependency from main project
- Moved UPSVarGauge into a Controls namespace, and making explicit references in WinNUT form.
- Applying autogenerated OnInitialize function in the Application designer file.

Author: gbakeman