Add cruise mode

[JonnyFPV]

Hello,

If it’s possible I would like an cruise mode.

You activate it and the plane or copter flyes in a straight line in current altitude and current heading until you switch it off or failsave kicks in. It would be nice that you can overright the heading and altitude with sticks ...

Thank you :)

[Tygrys-1]

AFAIK you may combine Altitude Hold with the Heading Hold Mode.

[Dronek]

#1416
#1712

[stale]

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[fiam]

Fixed in #3311