Is your feature request related to a problem? Please describe.

F3D support commands that can be inputted using console or command-script.
Add a new command with action clear that takes no argument and clear the console content.

Describe the solution you'd like

• in interactor_impl.cxx add a new command with action clear
• Add the Clear method in vtkF3DUIConsoleActor and vtkF3DImGuiConsoleActor
• add a test that run the command print_scene_info, then the new command clear, and check that the console log is empty