ImageInputSystem: configuring over XML

The ImageInputSystem contains one list (<std_vector>) of Sensors. All sensors are loaded over the plugin loader for the class Sensor.

Actually Possible entries are:

<CameraDriverRelay>

<StereoSensor>

<SwissRangerRemoteSensor>

<CameraDriver>

<SimulatedCamera>

<ROSCOPCamera>

<NetworkCamera>

see also <config>