Use self.report() Instead of Popup Menu

[Midnight Arrow]

This follows on from #2188.

Currently, when a figure is loaded, there is an informational popup informing the user the scene’s render properties have been updated.

The “standard” way to do this in Blender is to use self.report({“INFO”}, message_text) inside the operator to display a brief message on the status bar, and redirect the user to the console or the Info editor for more information. I recommend this change to bring the addon more in line with Blender’s best practices.

[Thomas Larsson]

Implemented in last commit. There may be some glitches with easy import that invokes a lot of other tools, but so far it looks fine.