- solutions support still VS2017 and VS 2019 - ci now also tests net462 & netcoreapp3.1 - next rev of nuget packages will have netstandard2.1 support - a few small fixes for netcoreapp3.1
* Clean UA Reference solution * Move ReferenceClient/Server * Copy Client/ServerControls libraries Fix project references * Rename docs to Docs * Rename GDS libraries according to naming convention