970 make tiglwinginterpolatexsi work on a single segment that is not part of a component segment

[AntonReiswich]

Description

In order to fix #970, the function tiglWingInterpolateXsi has been generalized. The generalization allows to not only use the function for segments that are not contained in a component segment (c.f. #970), but also more generally. Consider the following illustration that demonstrates the generality in which tiglWingInterpolateXsi can be used now:

Assume the depicted wing has four segments S1, S2, S3 and S4 and two component segments CS_A and CS_B.
The three arguments of the function firstUID, secondUID, intersectionUID can be now chosen (to give only few exapmles) in the following way:

• S3, S3, S3 (which fixes Make tiglWingInterpolateXsi work on a single segment, that is not part of a component segment  #970)
• S1, S3, CS_A
• S1, S3, S3
• CS_A, CS_B, S1
• CS_A, CS_B, S3
• ...
  More precisely: firstUID, secondUID, intersectionUID can be either a segment or component segment, respectively. The segments don't necessarily need to belong to a component segment. The component segments refered by the UIDs don't need to be the same. The only restriction is that all segments or component segments refered by the three UIDs are part of one and the same wing. If the intersection if outside the segment or component segment refered by intersectionUID an error gets thrown, as for example if one chooses S3, S4, S1.

How Has This Been Tested?

New test data (test_wing_segment_special_modified_component_segments.xml) has been added together with unittests in WingInterpolateXsi to check new functionalities that on the one hand show that the bug in issue #970 is fixed and on the other hand to check the functionalities that came with generalizing the function even further.

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]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (bd9dca3) 68.75% compared to head (b9db981) 68.94%.
Report is 27 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #979      +/-   ##
==========================================
+ Coverage   68.75%   68.94%   +0.18%     
==========================================
  Files         299      299              
  Lines       26481    26509      +28     
==========================================
+ Hits        18208    18277      +69     
+ Misses       8273     8232      -41     

Files	Coverage Δ
src/wing/CCPACSWingComponentSegment.cpp	76.28% <100.00%> (+1.33%)	⬆️
src/wing/tigletaxsifunctions.cpp	81.45% <96.36%> (-6.05%)	⬇️

... and 9 files with indirect coverage changes

[joergbrech]

Thanks @AntonReiswich. I just have some minor review comments.

[AntonReiswich]

Thanks a lot for the code review!