util img: new fast version of DataArray2RGB

On large images (2560x2048 uint16): 250 ms -> 60 ms

As DataArray2RGB is a big bottleneck for latency of the images, this should bring a little
bit of improvement in the GUI when receiving large images.
acq stream: also store ACQ_DATE in RGB array for debuging

allows to trace the latency

in addition, put some debug info about the latency
gui canvas: add logging about latency

also fix a small bug that could cause errors when closing the debug pan and the zoom is at the maximum.