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.
• CRUS TOS (DED: Add CRUS TOS mode #543)
  • Fix formatting (DED: Fix CRUS TOS page formatting #600)
• CRUS EDR (DED: Improve CRUS RNG & add CRUS EDR #575)
  • Add airspeed cue & optimal mach number (max endurance at current altitude)
• CRUS HOME
• CRUS RNG
  • Fix formatting (DED: Improve CRUS RNG & add CRUS EDR #575)
  • Support active steerpoint
  • Add airspeed cue (max range at current altitude)
• Fix the CRUS mode selection to use M-SEL button instead of enter button.
• 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)