* Integrated OpenGV
* Fixed build without opengv
* Cmake: moved OpenGV dependency status under solvers group
* Added multi-stereocamera models support
* Fixed OpenGV 0 sample error when one of the camera doesn't have features. Fixed g2o BA id offset with multi-camera.
* Fixed multicam 3d points generated from stereo correspondences
* db: Fixed multi stereo models not loaded correctly
* gui: fixed stereo rectification option, RegVis: fixed projection error with old databases (image size not set in calibration)
* OdomF2M: Fixed map.at error when bundle adjustment is not used
* depthai: added imu firmware update option for convenience
* Fixed various refactor errors
* Moved "large number stereo correspondences rejected" warning outside computeCorrespondences function for multicam
* Added error log if ba correspondences are computed with empty signatures
* fixed compilation errors with latest opencv
Co-authored-by: mathieu86 <mathieu@robust.ai>
CameraRealSense2: added new warnings to debug easier timestamps problems.
GUI: added gravity visualization.
DbViewer: empty clouds in OctoMap mode have color depending on probability of occupancy.
Brought general changes from local xvision branch.
-CreateSimpleCalibrationDialog updated to create mono/stereo calibration files with advanced option (setting intrinsics of each camera + extrinsics between them). Rectification R and new camera P matrices are then automatically computed.
-Added GeodeticCoords class for convience conversion between GPS values (latitude/longitude/altitude) to local coordinate (ENU).
-Added support of Malaga Urban and St Lucia ground truths.
-CameraImages: added option to debayer images. Timestamps file: added support of "sec millisec" format.
-Added UException class: exceptions are sent instead of exiting the application on UASSERT or UFATAL.
