Remove gamish style startup screens

I would like to be able to present the sim in a more professional way. Therefore I would like to fire it up seeing only a personalized picture and a progress bar. There it should stay in a standby mode consuming minimum energy.

On a networked laptop I run FSFlightControl. So once the sim is loaded it should present something like “waiting for instructor” and start the scenario as soon as FSFlightControl sends the go signal.