Remove DLLs from source code repository

[bdukes]

Summary

This PRs removes DLLs from the git repo, mostly replacing them with NuGet references.

• Microsoft.ApplicationBlocks.Data.dll (NuGet)
• DotNetNuke.Log4Net.dll (unused, removed)
• Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll (NuGet)
• Lucene.Net.dll (NuGet) and Lucene.Net.Contrib DLLs (NuGet)
  • There's also Website/App_Data/FipsCompilanceAssemblies/Lucene.Net.dll which needs to stay for now. Lucene 4.x (in beta since 2017) does not need a special FIPS mode, but 3.0.3 had a constant to change and recompile. I briefly investigating cloning and rebuilding as part of the build process, but it's old enough that there are a lot of old versions of tools we'd need to also install to make it work.
• Microsoft.WindowsAzure.Storage.dll (NuGet)
  • This is out of date (it's on 8.3.0, latest version is 9.3.3) and also the package itself is out of support (recommended moving to Azure.Storage.Common)
• Yahoo.Yui.Compressor.dll and Yahoo.Yui.Compressor.MsBuild.dll (removed)
  • I removed the CSS compression step altogether. This only affects the Dnn.AdminExperience packages, and all of the React and Stencil components already minify their CSS, so only the hosting components and a couple of the extensions that are using plain Knockout, etc.