Multicommit!

* Fix minimums display on PFD.
* Add "private/state" module.
* Various small display adjustments related to new font.
* Support switchable STD pressure in FMS.
Add Painter. Add shadows under features on instruments.
Compute/show pitch limit.
Shadow under texts. Moar shadowed features on EFIS.
Add Configurator, show/hide it with F1.

Remove PropertyTree module.
Remove unused Speed properties in FMS.
Add PropertyEditor.

Obviously with minor rendering fixes.
AOA is not the same as FPM.
Add RCMS that computes home position and distances.
Add <power> and <scale> parameters to the Joystick module.
Rename FMS to FDC (FlightDataComputer).
Move mouse module to IO, where it belongs.
Fix bug in EFIS when displaying CMD altitude.
Fixup moving the mouse module.
Throw error if unknown properties are configured.
Fix not working fly-by-wire module.
Cleanup in property paths. Annotate TODOs.