Add exercise_wrapper avaliable with teleoperable person

[Blancasr]

No description provided.

[OscarMrZ]

In the new manager, the exercise can use the gui_broker started by the manager to communicate with the browser, so I think no exercise wrapper is needed.

[jmplaza]

Yes, the teleoperation will performed with the GUI.py receiving the pressed keys from the browser through the regular websocket connecting the RAM (and the gui-broker) and the browser. This way no extra port will be required and the functionality is solved in the python template, not in the manager.
The corresponding issue is JdeRobot/RoboticsAcademy#2415