Found my old "always random LUT" code for a new test of GPU upload speed. #BigVolumeViewer

I'm always very happy to see the #Fiji gang & co, this time during the OME-Zarr Java hackathon in Dresden (imglib2/BDV motherland?).
My personal progress: increasing max # of volumes in #BigVolumeViewer from 15 to ~200. Still not high enough, but there was not enough time.