Aravis several updates
* Fix adressing camera with id=0
* Aravis buffer property control & status added
* Modify of autoexposure algorith, ream frame ID from aravis + new properites
* Change of macro name
* VideoCapture now returns no frame on camera disconnecion
* Allow aravis-0.4 usage, proper camera object release.
Aravis SDK: Basic software based autoexposure control
* Basic software based autoexposure control
* Aravis autoexposure: skip frame taken while changing exposure setup