Native DLLs are not copied into the output directory of Design library

[jonnew]

1. clroni has several native dependencies (liboni.dll, onidriver_<whatever>.dll).
2. OpenEphys.Onix1 references the clroni nuget package and these native dependencies are copied into its build directory. This occurs because clroni contains a clroni.targets files with instructions for extracting its native libraries:
   
3. OpenEphys.Onix1.Design references the OpenEphys.Onix1 project, which itself references the clroni nuget package. However, when built, native dependencies are not copied to the build directory. When debugging, this results in a native methods exception because there is no native library.
   
4. Directly references the clroni nuget package in the OpenEphys.Onix1.Design project solves this issue, but feels like a hack because clroni is not directly referenced in the design project code.

[jonnew]

Maybe a hint: I could be the original target architecture for clroni. OpenCV.NET for instance is targeted against AnyCPU whereas we have different targets for x64 and x32, the later of which is not even supported by our hardware.

https://github.com/horizongir/opencv.net

[jonnew]

@bparks13 It was suggested that we move to the more recent solution format: #445 Perhaps it would be worth trying to solve this issue too along with that since they are both related to build configuration.

[jonnew]

MSBuild will not copy dependencies through transitive project references if they are not directly called in the code. Since native library cannot be directly called, it will not be copied. Therefore, the only solution is to provide a direct package reference. But this is redundant because the OpenEphys.Onix1.Design nuget pacakge dependents on OpenEphys.Onix1, which does include clroni as a direct package reference, and thus will it get these native libraries.

Therefore, the best option is to just have an AfterBuild target that copies them into the build folder for development purposes:

  <Target Name="CopyNativeDependencies" AfterTargets="AfterBuild">
    <ItemGroup>
      <NativeDlls Include="$(OutputPath)..\..\OpenEphys.Onix1\$(ArtifactsPivots)\*.dll" />
    </ItemGroup>
    <Copy SourceFiles="@(NativeDlls)" DestinationFolder="$(OutputPath)" />
  </Target>