* Make double_pendulum's joints unbounded revolute (continuous)

* Add continuous (SO(2)) variant of double_pendulum

* Remove update to deprecated function; inherit from DoublePendulumLoader

* Add unit test

* [cassie_description] initial commit

* [cmake] update

* [cassie.sdf] change mesh path relative to example-robot-data

* [cassie_description] move meshes up folder

* [cassie-loader] create loadCassie function for load with sdf

* cassie srdf: standing pose

* [cassie_loader] use robotloader

* add unittest. won't yet work before pinocchio3

* Update unittest/test_load.py

Co-authored-by: Guilhem Saurel <guilhem.saurel@laas.fr>

* ci fixes: flake8 + unittest missing module

* fix test

Co-authored-by: Rohan Budhiraja <proyan@users.noreply.github.com>
Co-authored-by: Guilhem Saurel <guilhem.saurel@laas.fr>

* [loader] SDF support

Co-authored-by: Guilhem Saurel <guilhem.saurel@laas.fr>

* [bugfix] Included the velocity limits in the talos-legs model

And activate tests again

to avoid a dependency to https://github.com/stack-of-tasks/talos-data/
in many packages

and document their purpose

Which lead to find that __main__ was missing the variations of icub &
ur5

Gathering all expected available robots and parameters in one dict
indexed by names avoid the need to duplicate those informations.

when it was useless otherwise