Fix #975: Transform rX-Direction of guide curve with wing coordinate system

[merakulix]

Description

Now the rX-Direction respects the wing coorddinate system

How Has This Been Tested?

Visual confirmation in TiGL Viewer and new unit test

Screenshots, that help to understand the changes(if applicable):

Checklist:

• A test for the new functionality was added.
• All tests run without failure.
• The new code complies with the TiGL style guide.
• New classes have been added to the Python interface.
• API changes were documented properly in tigl.h.

[codecov-commenter]

Codecov Report

Merging #976 (f8f027e) into master (5f3e172) will increase coverage by 0.15%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #976      +/-   ##
==========================================
+ Coverage   68.75%   68.90%   +0.15%     
==========================================
  Files         298      298              
  Lines       26479    26479              
==========================================
+ Hits        18206    18246      +40     
+ Misses       8273     8233      -40     

Files	Coverage Δ
src/wing/CTiglWingSegmentGuidecurveBuilder.cpp	88.88% <100.00%> (ø)

... and 5 files with indirect coverage changes