DED CRUS Improvements

[BobDotCom]

Taken from #543

Todo

• [ ] Rewrite the HUD cues to no longer depend on the HUD SVG. Not urgent and doesn't change functionality but requested by @NikolaiVChr.
• [x] CRUS EDR (#575)
  • [ ] Add airspeed cue & optimal mach number (max endurance at current altitude)
• [ ] CRUS HOME
• [x] CRUS RNG
  • [x] Fix formatting (#575)
  • [ ] Support active steerpoint
  • [ ] Add airspeed cue (max range at current altitude)
• [x] Fix the CRUS mode selection to use M-SEL button instead of enter button.
• [x] Bind the airspeed cues to a min/max vertical position, the MLU m1 doesn't mention this but I think it would make sense. (5d58b18)