created symlink, modified python lib name

To ease search of the SDK and odri_control_interface when they are installed in the same prefix

Add new Filter class to filter position and velocity quantities given to the MPC (4th-order Butterworth filter to low-pass at 25Hz)

Remove osqp files that were included in the repository since they were conflicting with the standard osqp install

* Code cleaning and refactor
* Add Types, FootTrajectoryGenerator, Gait, FootstepPlanner classes
* Rename quadruped-reactive-walking qrw

Authored-by: Fanny Risbourg <frisbourg@laas.fr>

Finish OSQP implementation (not working because needs symmetric P matrix) + Add dependency to eiquadprog