Fix flight plans

[Fabien-B]

Remove most of the illegal characters in flight plans.

[gautierhattenberger]

what about the deref operator -> ? It is possible to use the keyword @DEREF, but in many cases, it is probably even better to use the macros like GetPosX.

[Fabien-B]

I Replaced it for most cases I think.
What it seen very often is stateGetPositionEnu_f()->z.
The closest macro I found is for rotorcrafts: #define GetPosAlt() (stateGetPositionEnu_f()->z+state.ned_origin_f.hmsl).
Should these occurrences be replaced by this macro ? Won't it change the behavior ? What is state.ned_origin_f.hmsl ?

[gautierhattenberger]

It is a bad way to have the reference altitude, aka ground alt. So it is probably a good idea to add a macro GetPosHeight that just returns stateGetPositionEnu_f()->z

[Fabien-B]

I agree, I did that.