image_pipeline
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Use TF2 package for quaternion conversion
The OpenCV quaternion class was not added until OpenCV 4.5.1, so it's less widely available than the TF2 conversion. This change allows a source build of the ROS 2 "perception" variant on Ubuntu 20.04 without a custom source build of OpenCV.
Addresses issue https://github.com/ros-perception/image_pipeline/issues/1030