CI + Testing + Bugfixes for path + misc. fixes + linting

[nandantumu]

This is an initial implementation of CI pipelines. In order to separate failures, test failures and linting failures are implemented as their own pipelines. Tests were ported to the tests directory. Much of these tests are still not really functional. Regression testing must be a contribution priority moving forward.

[nandantumu]

All of the tests fail, but this is on purpose.

[luigiberducci]

@nandantumu
The utility functions in the test of collision models are duplicated (I have missed that in dev_refactoring).
Please delete them and keep them in collision_models.py in the next commit

[nandantumu]

The build fails, this is expected. Bugfixes are required.

[luigiberducci]

@nandantumu test_scan_sim.py uses matplotlib to visualize the scans in polar coordinates.
What about removing that code?

[nandantumu]

Fixed the issues with the map download on windows, and the path issues in the tests.

[nandantumu]

This is now good to merge, imo. All linting errors have been cleared, the only test that fails is the ST dynamics, which only fail by a small amount. I believe this is linked to #53

[luigiberducci]

Refactored tests that contain utility functions (shadowing the actual utilities to test).

Apart from the dynamics test, which should probably be addressed separately, looks good to me.