Drive off the 'show view names' checkbox in the view dialog for now, this might
evolve into a generic 'on-screen hints' control to avoid an explosion of
GUI checkboxes.
Also add a GUI checkbox (oh the irony...) to disable mouse flight-controls, to
keep AndersG and Emilian happy.
This is temporary (hopefully!), to allow experimentation with different UX options in the near future. Right now it basically does nothing. As part of this, factor mouse-mode cycling into a separate command, and add some feedback. Feedback mechanism needs work, currently abusing the copilot facility.
