Add a registration if something is drawable. Add a null check.
MAGN-281. Don't draw faces in geomkeeper.
Visualization thread always need to unblock.
Remove registration methods on visualization manager.
Don't test viz added when node added.
Add null check for triangulated mesh.
MagnetoOLD-503. Add Floor node.
MAGN-122. Add Wall By Curve node.
Merge branch 'master' into CommandFramework

Conflicts:
	src/DynamoElementsTests/VisualizationManagerTests.cs