[CMake] add BUILD_PYTHON_INTERFACE option

Remove shell

ref https://github.com/stack-of-tasks/sot-core/issues/58

[CI][CMake] add .gitlab-ci.yml & badges, sync submodules, update cmake

Remove useless headers + update cmake submodules
Thanks to Joseph Mirabel for pointing this out.

Added createVelocity command

TODO: update test_config to reflect new API.

[python][AbstractHumanoidRobot] Remove default signal creation.

* Position and Jacobian signals should be created when called

Update to pinocchio 1.2.4

[python][humanoid_robot] create op point signals with name of op point

Create internal Signals. Avoid unnecessary computations. Change the signal dependencies