FlightGear - Flight Simulator FGAddon

[Michael Danilov]
* Headsight: fix gyro mode being reversed.
* Hotkey for toggling flight stick.
* Instruments: brake emergency gear, flaps manometers are mechanical, and their needles do not shake.
* 3d: remove emit from external model (leave cockpit emit until cockpit lighting is done)
* Gyrocompass: more sensible heading ticks.
* ASP-3: disable hotspots when stowed.
* Disable canopy hotkey when airborne.
* Manual: https://www.governmentattic.org/14docs/MIG-15pilotOpManual_1955.pdf
* Convert Flapscontrol to knob.

[Jüttner Domokos]
* Convert some cockpit controls to knob animations.
* Move starter button to throttle lever, per pilot's operating handbook.
* Nasal/MiG-15bis.nas (bitswap): delete; use <property-toggle> instead in animations.