Put the system types into Revit.System. I don't like this, but we have to figure out how to hide them completely.
Cleanup a dead class diagram.
Beginning work on levels drop-down.
Implement locking on NodeModel.RenderPackages.
Cleanup old render code.
Remove ThreadSafeLists.
Merge branch 'ChocoButter-2Become1' of github.com:DynamoDS/Dynamo into ChocoButter-2Become1