Added a vizualisation of the user gaze
Added a vizualisation of the user gaze

Requires to gaze to be plublished on /gazepose_on_sandtray

Enable/disable it from debug menu

EmmanuelSenft/freeplay-sandbox-qt,emmanuel-senft/freeplay-sandbox-qt,emmanuel-senft/freeplay-sandbox-qt,severin-lemaignan/freeplay-sandbox-qt,EmmanuelSenft/freeplay-sandbox-qt,severin-lemaignan/freeplay-sandbox-qt