Implemented frame acquisition, camera PTP synchronisation (doesn't work)
    and camera calibration.
Changed calibration system to have one calibrator object per camera.
Known issues:
	StereoPair calibration doesn't work (problem with map::reverse_iterator?)
	Calibration introduces delays on frame rendering.

Signed-off-by: Vinicius Dias de Oliveira Gardelli <gardelli123@gmail.com>