Add CCPACSSkin to Python bindings

[joergbrech]

Fixes #1037

Description

This PR adds the missing#include and %include statements to the swig interface file configuration.i.

How Has This Been Tested?

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

Not applicable.

Checklist:

Task	Finished	Reviewer Approved
At least one test for the new functionality was added.	yes does not apply	OK
New classes have been added to the Python interface.	yes does not apply	OK
The code is properly documented with doxygen docstrings	yes does not apply	OK
Changes are documented at the top of ChangeLog.md	yes does not apply	OK

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 12 lines in your changes missing coverage. Please review.

Project coverage is 69.47%. Comparing base (c5ccbb2) to head (9281d66).
Report is 38 commits behind head on master.

Files with missing lines	Patch %	Lines
src/fuselage/CTiglStringerFrameBorderedObject.cpp	0.00%	12 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1041   +/-   ##
=======================================
  Coverage   69.47%   69.47%           
=======================================
  Files         301      301           
  Lines       26889    26923   +34     
=======================================
+ Hits        18681    18705   +24     
- Misses       8208     8218   +10     

Flag	Coverage Δ
unittests	69.47% <0.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/fuselage/CTiglStringerFrameBorderedObject.cpp	0.00% <0.00%> (ø)

... and 4 files with indirect coverage changes

[merakulix]

Short update: CCPACSkin is available now via Python Bindings, CPACSSkinSegments as well. I also tested some of the getter functions of boost::optional types in CCPACSFuselageStructure, such as stringers, frames, cargo_cross_beams, cargo_cross_beam_struts, which are also available now. As discussed with @joergbrech, see RISCSoftware/cpacs_tigl_gen#59 about the getter functions for the vector elements