Fast-oad

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- Bug fixes:
- Fixed usage of list_modules with CLI. (https://github.com/fast-aircraft-design/FAST-OAD/pull/395)

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- Changes:
- Added new submodel feature to enable a more modular approach. (https://github.com/fast-aircraft-design/FAST-OAD/pull/379)
- Implemented the submodel feature in the aerodynamic module. (https://github.com/fast-aircraft-design/FAST-OAD/pull/388)
- Implemented the submodel feature in the geometry module. (https://github.com/fast-aircraft-design/FAST-OAD/pull/387)
- Implemented the submodel feature in the weight module. (https://github.com/fast-aircraft-design/FAST-OAD/pull/385)
- Added the possibility to list custom modules. (https://github.com/fast-aircraft-design/FAST-OAD/pull/369)
- Updated high lift aerodynamics and rubber engine models. (https://github.com/fast-aircraft-design/FAST-OAD/pull/352)
- Added custom modules tutorial notebook. (https://github.com/fast-aircraft-design/FAST-OAD/pull/317)
- Bug fixes:
- Fixed incompatible versions of jupyter-client. (https://github.com/fast-aircraft-design/FAST-OAD/pull/390)
- Fixed the naming and description of the virtual taper ratio used in the wing geometry. (https://github.com/fast-aircraft-design/FAST-OAD/pull/383)
- Fixed some wrong file links and typos in CeRAS notebook. (https://github.com/fast-aircraft-design/FAST-OAD/pull/380)
- Fixed issues with variable descriptions in xml file. (https://github.com/fast-aircraft-design/FAST-OAD/pull/364)

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- Changes:
- Now using the new WhatsOpt feature that allows to generate XDSM files without being registered on server. (https://github.com/fast-aircraft-design/FAST-OAD/pull/361)
- Optimization viewer does no allow anymore to modify output values. (https://github.com/fast-aircraft-design/FAST-OAD/pull/372)
- Bug fixes:
- Compatibility with OpenMDAO 3.10 (which becomes the minimal required version). (https://github.com/fast-aircraft-design/FAST-OAD/pull/375)
- Variable descriptions can now be read from comment of XML data files, which fixes the missing descriptions in variable viewer. (https://github.com/fast-aircraft-design/FAST-OAD/pull/359)
- Performance model: the computed taxi-in distance was irrelevant. (https://github.com/fast-aircraft-design/FAST-OAD/pull/368)

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- Changes:
- Enum classes in FAST-OAD models are now extensible by using `aenum` instead of `enum`. (https://github.com/fast-aircraft-design/FAST-OAD/pull/345)
- Bug fixes:
- Incompatibility with `ruamel.yaml` 0.17.5 and above has been fixed. (https://github.com/fast-aircraft-design/FAST-OAD/pull/344)
- Computation of partial derivatives for OpenMDAO was incorrectly declared in some components.
MDA, or MDO with COBYLA solver, were not affected. (https://github.com/fast-aircraft-design/FAST-OAD/pull/347)
- Errors in custom modules are no more hidden. (https://github.com/fast-aircraft-design/FAST-OAD/pull/348)

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- Changes:
- Configuration files can now contain unknown sections (at root level) to allow these files to be used by other tools. (https://github.com/fast-aircraft-design/FAST-OAD/pull/333)
- Bug fixes:
- Importing, in a `__init__.py`, some classes that were registered as FAST-OAD modules could make that the register process fails. (https://github.com/fast-aircraft-design/FAST-OAD/pull/331)
- When generating an input file using a data source, the whole data source was copied instead of just keeping the needed variables. (https://github.com/fast-aircraft-design/FAST-OAD/pull/332)
- Instead of overwriting an existing input files, variables of previous file were kept. (https://github.com/fast-aircraft-design/FAST-OAD/pull/330)
- A variable that was connected to an output could be incorrectly labelled as input when listing problem variables. (https://github.com/fast-aircraft-design/FAST-OAD/pull/341)
- Fixed broken links in Sphinx documentation, including docstrings. (https://github.com/fast-aircraft-design/FAST-OAD/pull/315)

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- FAST-OAD now requires a lower version of `ruamel.yaml`. It should prevent Anaconda to try and fail to update its
"clone" of `ruamel.yaml`. (https://github.com/fast-aircraft-design/FAST-OAD/pull/308)