Fix calc_heading

[ufechner7]

This is broken since on the main branch because I changed the sign of the y-axis of the kite reference frame.

To fix it:

• add a unit test for orientation = 0,0,0
• add unit tests for different roll angles
• add unit tests for different pitch angles
• add unit tests for different yaw angles

These tests need to be executed for different wind directions.

You can find a graphical definition of the heading angle here: https://ufechner7.github.io/KiteUtils.jl/dev/reference_frames/

[ufechner7]

Development happens in the fix_yaw branch. One of the test scripts is examples_3d/parking_4p.
To run this script, execute:

julia --project
using Pkg
Pkg.update()
include("examples_3d/parking_4p.jl")

[ufechner7]

Shall be fixed in #78
The core routines are in the KiteUtils package in the file https://github.com/ufechner7/KiteUtils.jl/blob/main/src/trafo.jl

TODO:

• document the definition of the KiteSensor (KS) reference frame
• document the definition of the Earth Xsens (EX) reference frame

[ufechner7]

Related: #81

[ufechner7]

Not using the fix_yaw branch any longer. Replaced by #84