Maintenance / Minor changes

[bcoconni]

This PR brings a number of minor changes and fixes:

• In the CI workflow, MinGW32 has been renamed to MinGW as MinGW is no longer limited to 32 bits as stated on their website.
• Fix the codecov job which was broken since PR #1032: the coverage data were no longer uploaded to codecov.io.
• Extend the usage of CMake target_include_directories, following the lead of PR #1022 (there are still a few places that use include_directories and this will be addressed in a later PR).
• Make the unit test test_inherit_with_extra_args more robust. Indeed there are some subtleties between __cinit__ and __init__:
  • The test now checks that the parameters root_dir and pm_root are properly handled.
  • Since the class FGFDMExec has no constructor __init__, there is no need to call it.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 41.37%. Comparing base (6f0c4d8) to head (ce8bd80). Report is 11 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1050 +/- ## =========================================== + Coverage 24.87% 41.37% +16.49% =========================================== Files 168 198 +30 Lines 18908 24071 +5163 Branches 0 3170 +3170 =========================================== + Hits 4704 9960 +5256 + Misses 14204 14062 -142 - Partials 0 49 +49 ```

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[bcoconni]

The codecov report is back, confirming that this PR fixes the coverage job in cpp-python-build.yml :smile: