CLI Node Improvements

[NicerNewerCar]

We have to wait for the CLI nodes to finish running before moving on.

Currently, we are using a "busy wait" loop, but this could be improved:

SlicerAutoscoperM/AutoscoperM/AutoscoperM.py

Lines 1001 to 1010 in a18dbab

	# Wait for all the CLI nodes to finish
	for i, cliNode in enumerate(cliNodes):
	while cliNodes[i].GetStatusString() != "Completed":
	slicer.app.processEvents()
	if cliNode.GetStatus() & cliNode.ErrorsMask:
	# error
	errorText = cliNode.GetErrorText()
	slicer.mrmlScene.RemoveNode(cliNode)
	raise ValueError("CLI execution failed: " + errorText)
	slicer.mrmlScene.RemoveNode(cliNode)

Items to investigate:

• Observers
• Asyncio