ADViewer - Do not update the plot whilst the roi is being changed
Allow setting of device permission

SCATTER-171 SCATTER-161
Merge branch '8.36' of ssh://dasc-git.diamond.ac.uk/gda/gda-epics into 8.36
SCATTER-179

only change gain in one direction per readout request
Merge branch '8.36' of ssh://dasc-git.diamond.ac.uk/gda/gda-epics into 8.36
Merge branch '8.36'