Prevent UnkownEscapeSequence warnings when comments have backslashes

[MichaelSchuldes]

Summary

When generating the python code from protobuf, backslashes in the comments are replaced with double backslashes to prevent UnkownEscapeSequence warnings. E.g., this fixed this library for proto files from https://github.com/OpenSimulationInterface/open-simulation-interface/blob/master/osi_featuredata.proto .

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
  • This change has an associated test.
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)

[AdrienVannson]

Thank you for the PR!

Indeed, this is a useful change. Can you fix the code quality check? I can merge afterwards. If you want you can also add a small test to check that the generated docstring is the one expected (I can also do it later).

I think it would also be useful to add something like .replace('"', '\"') since triple quotes can also break comments.

[AdrienVannson]

This is fixed in 0.3.2, thanks!