image_pipeline
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add image_flip node
This is a continuation of https://github.com/ros-perception/image_pipeline/pull/756:
- [x] Squashed 16 commits in original PR for ease of rebase/review
- [x] Moved node into image_rotate package
- [x] Added lazy subscriber
- [x] Removes QoS parameters - will add proper QoS overrides in a different PR (when we do the same for image_rotate)
- [ ] Adds documentation
After reviewing this closer - I may also make both nodes derive from a base class to avoid so much duplicated code