FlightGear - Flight Simulator FGAddon

Work in progress (lighting)

* put instrument lights on ELknob on lighting panel (emis animation)
* put emis-animation for panel and instruments on CenterPanelLight
knob on lighting panel (still needs conditioning! If Rembrandt is
on -> switch all panel emis to 0.0)
* imported instruments from fgdata/Aircraft/Instruments-3d
* changed Nasal/electrical.nas, so that
prop:controls/lighting/<panel-norm>
<instruments-norm>
<instrument-lights-norm>
start with value 0.0