Fix MAGN-2523 Revit Elements not cleaned up after initial failure of the element creation node
Fix MAGN-5027 Dynamo doesn't notice changes to levels in Revit
Move one utility function to RevitServices
Removed "NodeViewModel.OldValue" property
Removed "EngineController.GetStringValue", it's not referenced
Update one test case
fix for flaky excel tests
Fixed deadlock in Watch3DView.VisualizationManagerRenderComplete
Updated "AutomationSettings" to wait for evaluation timer
Fix levels tests.
Fix Revit_Color test...

DSCoreNodes was being duplicated into the nodes folder and causing a
class version error with DSColor. I've removed several copy-locals to
clean the nodes folder.
Merge branch 'master' into magn-5027

Conflicts:
	test/Libraries/Revit/RevitIntegrationTests/ElementBindingTests.cs
Modify test cases after merge
Merge pull request #2936 from aparajit-pratap/coconutBugs

Fix for flaky excel tests
Merge pull request #2873 from Randy-Ma/magn-5027

Fix MAGN-5027 Dynamo doesn't notice changes to levels in Revit
Merge pull request #2854 from Randy-Ma/magn-2523-fix-option-1

Fix MAGN-2523 Revit Elements not cleaned up after initial failure of the element creation node
Restored all "PauseAfterPlaybackInMs" value to default of "10ms"
Turned "AutomationSettings.HasPendingEvaluation" into a property
Merge pull request #2947 from Benglin/Flaky

Fixed flakiness in recorded tests
Merge branch 'master' of https://github.com/DynamoDS/Dynamo into OldValueMustDie