Misc fixes to materials and modelling

[legoboyvdlp]

• Fixed material settings in cockpit so the switches aren't black
• Fixed fuel pump switch models
• Removed duplicate oh-panel.ac
• Fixed z-fighting in flightdesk.ac
• Improved ambient lighting parameter for the wings and horizontal stabalizer
• Rewrote landing gear control nasal file

I'm going to push this to 'for-fgaddon' rather than master because 1) 'master' has WIP changes that are not working (nasal errors) 2) The other fixes to the flap lever, to the speedbrakes were pushed only to 'for-fgaddon'

[zakalawe]

Thanks, going to sync this with FGaddon/trunk later today, hopefully.