Various maintenance fixes - #2

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jdiez17 wants to merge 3 commits into

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jdiez17:py3_fixes

Commits on Feb 8, 2021

Fix relative imports, replace `print x` with `print(x)`
jdiez17
committed
d487160
Fix camera namespace in launch script.
jdiez17
committed
8b99ede
Pass `rvec` and `tvec` to `cv2.aruco.estimate*` fns.
jdiez17
committed
897593c