Recording state when closing ArViz Godot

• When closing ArViz Godot while recording is running, ask user with a pop up whether recording should keep running or stop
• Mimic behavior of Coin Gui when starting recording, but one is already running (maybe uses return of startRecording())

(maybe in a 2nd MR since it requires changing the ArViz interface:)

• Fetch recording state from Storage to reproduce GUI state prior to closing GUI / update to current recording state of ArViz Storage. Requires adding that info to return of getAllRecordings() in ArViz interface