locomotion module refactoring.
- Create a ContactSequenceWrapper, which contains the objects discussed in https://gepgitlab.laas.fr/loco-3d/multicontact-api/issues/6
- Separate the CentroidalPhi and EESplines classes. Doesn't depend on anything.
- Separate the polyfitND function wrapper. Depends on numpy only.
- Separate the multiphase problem definition which depends on crocoddyl.
The contactsequencewrapper class is a placeholder, untill https://gepgitlab.laas.fr/loco-3d/multicontact-api/issues/6 is solved.
Edited by Rohan Budhiraja