keep path while updating

[merakulix]

The path of a CCPACSExternalObject was not accessible while reloading configuration.

Description

When updating the CPACS configuration after undo/redo the path gets saved temporarily and added to tixi handle.

When creating new configurations, that are not yet saved, the file path is not known, which is intuitive for new files, but a problem when needing to reload for theses processes.

Fixes #1219
Requires next TiXI release because the fix depends on a newly implemented function in TiXI. See TiXI issue 257 and TiXI PR 258

How Has This Been Tested?

In GUI, Step geometry get's reloaded now.

Screenshots, that help to understand the changes(if 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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.75%. Comparing base (08f4898) to head (d48e999).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1266   +/-   ##
=======================================
  Coverage   72.75%   72.75%           
=======================================
  Files         308      308           
  Lines       26993    26993           
=======================================
  Hits        19638    19638           
  Misses       7355     7355           

Flag	Coverage Δ
unittests	72.75% <ø> (ø)

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