MultiPhotonPoseEstimator improvements

[kcooney]

Filtering

• Poses that are not within the field are filtered out
• The builder has a withPoseFilter() method, to add additional
  filtering

Logging Support

• Add an overload for processAllUnreadResults() that allows the caller
  to be notified of rejected poses

Extract a Camera class

• This simplifies MultiPhotonPoseEstimator.Builder
• It allows users to create constant fields for each camera (or
  different cameras for different drivetrains)
• The Camera is passed to the callback given to
  processAllUnreadResults()
• The Camera class can be subclassed by users, to add additional data
  about the camera (for instance, you could provide a multiplier to apply to
  the standard deviation so that you could give a higher weight to some cameras).