NetStandard Library for UWP app

@viktoriad: this seems to be a VS/VC# issue? the Elements project itself compiles fine. We probably need to add the GetPackageOutpits task to the targets file. It seems to be a regular project reference in the VC# project.

    <ProjectReference Include="..\StraightSync.Library\StraightSync.Library.elements">
      <Project>{adc1d1dd-134a-41f7-a7e4-ef8534494eaa}</Project>
      <Name>StraightSync.Library</Name>
    </ProjectReference>

Niko, does this only fail if the VC# project references the Elements one, or also if you open there Elements one on its own? Also, as a workaround, can you use a regular .dll reference instead of a project one, to see if that works? ie:

    <Reference Include="StraightSync.Library">
      <HintPath>..\StraightSync.Library\Bin\Debug\StraightSync.Library.dll</HintPath>
    </ProjectReference>

or whatever the correct path is?

thanx!