Integrate managerTUG with navigation

[vvasco]

We want to integrate managerTUG with navController to develop the following scenario:

• the robot initially stands halfway between the starting and the end line;
• the robot navigates towards the end line while explaining the exercise to the user;
• the exercise starts and the robot tracks the skeleton. Importantly, the skeleton has to stay within the field of view to guarantee that the hand to be visible (this will be used to trigger the speech) and the feet to be visible (for motion analysis);
• the exercise finishes and the robot goes on a side, halfway between the starting and the end line, facing the user.

[vvasco]

Done in #226.