vision_opencv
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add OpenCV4 support
- removed the fixed version in the global CMakeList.txt to allow for automatic choice
- added a new case for OpenCV4 + new module_opencv4.cpp with the corresponding modifications
addresses ros-perception/vision_opencv#272
Isn't this a duplicate of https://github.com/ros-perception/vision_opencv/pull/259 ? Considering opencv2 is not a target anymore of ROS melodic, we can clean up the code (and therefore complexity and make it more future proof) by removing the old module entirely.