Set positive infinity values to 0 (Preprocessing)

[theBadMusician]

Time estimate: 8 hours

Description of task:
The positive infinity values from the confidence map are set to the biggest possible value during the confidence preprocessing, but they do not actually represent high confidence in the corresponding depth data. This can be tested by covering one of the lenses of the camera, which gives posinf filled confidence map, but completely empty depth map.

The function 'remove_nans' in 'confidence_mapping' module needs to be changed to take into account this fact.