Fix MAGN-2523 Revit Elements not cleaned up after initial failure of the element creation node
fixed stackvalues appearing in watch node
added test for watch nodes displaying functions
Fix for selection box dragged out of canvas.

Fix for User gets stuck in selection mode when selection box is dragged
out of canvas.
Toggle and highlight assemblies that are node libraries
Fixes MAGN-4817. Simplified convesion from a Autodesk.DesignScript.Arc to a Revit Arc, using 3 point constructor.
Fix MAGN-5027 Dynamo doesn't notice changes to levels in Revit
Deserialize/serialize node library names
Update installed packages UI to represent masked packages
Merge branch 'master' into MAGN-4817
Added test case for tilted arc
Suppressed internal Revit classes by marking them internal
changes to mark internally used Revit classes as internal
Fix mistake in HasAuthenticator
Various minor fixes
Added a new skeleton class "QueryMirrorDataAsyncTask"
Move one utility function to RevitServices
Removed "NodeViewModel.OldValue" property
Removed "NodeViewModel.OldValue" property
Removed "EngineController.GetStringValue", it's not referenced