Migrate from NRefactory to Roslyn

[MihailRomanov]

Migration plan:

• Migrate VB Binding

• Migrate C# Binding

• Analize and migrate from NRefactory base types (from project ICSharpCode.NRefactory) to own SD models (Code Dom, Avalonia Editor API, ...)

• Migrate other AddIns

  • Unit Tests
  • (?) XML / XAML / ...
  • ...