require dynamic-graph >= 4.4.0

[Python] format

move doc/make CommandVoid 5-8 to dynamic-graph

ref. https://github.com/stack-of-tasks/dynamic-graph/issues/36

[CMake] fix link to parameter-server

ref https://github.com/stack-of-tasks/sot-core/pull/175

[CMake] find -lparameter-server

[Tests] Activate test_ctrl_manager again

[Tests] Remove useless Rospack

Update necessary for robot-utils with property_tree

- removed custom DYNAMIC_GRAPH_PYTHON_MODULE
- moved python lib to dynamic_graph/
- added required ${plugin}-python.hh
- use np.array everywhere
- updated tests
- created delay.hh
- removed main plugin
- switched to example-robot-data instead of talos-data