reworked NuGet package to suppress architecture mismatch warnings with native libraries in any configuration
moved common assembly attributes to a shared location
added assembly attributes to both native DICOM libraries
replaced fixed NLog reference in DICOM unit tests library with the according NuGet package
removed x64 native DICOM library reference from ConsoleTest, as it is configured for x86 platform only
added some more intermediate paths/files to .gitignore