Adds python interface to Filter, MovingWindowFilter, RotationSpline.

[LolaSegura]

🎉 New feature

Goes on top of #221
Related to #101 #210

Summary

Adds Python interface for three math classes: Filter, MovingWindowFilter and RotationSPline. For each class a python test has been created.

Related issues and notes

Filter

The Filter.hh file contains various template classes that inherit from a Filter class, which is a template class itself. To create binding for this classes an instance of Filter<type> had to be declared previously.
There were some classes that inherit from an instance of another class. For example class OnePoleQuaternion : public OnePole<math::Quaterniond>. This wasn't being interpreted by swig as expected. The inherited methods that were not override, were not being created in the binding. The solution we implemented for this was define these classes inside the interface file without the inheritance and adding the methods that were not being created. A similar approach was taken in the SignalStats class (#220 ).

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

[francocipollone]

This PR is on hold until #221 is merged.

[codecov]

Codecov Report

Merging #230 (2eb2bab) into ign-math6 (b54dce5) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           ign-math6     #230   +/-   ##
==========================================
  Coverage      99.40%   99.40%           
==========================================
  Files             66       66           
  Lines           6185     6185           
==========================================
  Hits            6148     6148           
  Misses            37       37           

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[francocipollone]

LGTM

[francocipollone]

I'll solve the conflicts after #221 is merged.

[azeey]

Removing this line fixes the compilation error for me. Maybe it's a known issue, but I had to touch python.i for it to recompile this file.

[francocipollone]

Let me take a look. It seemed to be working before merging this branch with ign-math6.

[francocipollone]

You were right. That import was causing issues because of the syntaxis: it should be include instead of import

The truth is that that import wasn't necessary given that std::vector isn't being used in the API, so that import statement wasn't needed at all. I pushed the fix