Color frame is rgb #9
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On top of #8, this fixes the visible/color frame, which is
RGB8notMONO8.Before this PR (left):

After this PR:

Exposure is fix and illumination is relatively low, so the image is a little dark and noisy.
It's a shame this ROS wrapper doesn't allow to change the exposure. 😢
I think the IR images could also use a shallow copy as I do here for the visible/color image.
That would also be possible for the depth image if it were
uint16_torfloat, but already in meters instead of millimeters.