Implement stimuli-based gaze target generation based on laser-scanner features

The robot won't be able to react to events outside the FoV if it only relies on the cameras. Laser scanners scan the whole room and can detect changes in the scene (humans walking around, moving objects, ...).

basic

• detect clusters of laser scanner points that do not belong to any known object. This filter should be implemented in armarx::navigation. Also, check the laser-scanner based feature detection component.
• generate gaze targets

dynamic

• track and detect regions that change. The importance/priority of the target could be related to the frequency of change.
• generate gaze targets

For both, generate t