Radical Democracy (RTW) Release

We have just released (also on NuGet) the RTW version of Radical Democracy.

Closed issues: https://github.com/RadicalFx/radical/issues?q=milestone%3ADemocracy+is%3Aclosed

Some documentation improvements, that are always needed;
Removed a dependency on an old and legacy Radical package not required any more;
MessageBroker: async/await support;
A huge rework of the entire validation infrastructure to introduce INotifyDataErrorInfo support;

Please report any issue you may encounter.