BLXI-230: create a Pixium specifc control view for calibration and mode change on GUI 

add more PV field support to the Area detector

Task-Url: http://jira.diamond.ac.uk/browse/BLXI-230
Merge branch 'gda-8.42' of ssh://dascgitolite@dasc-git.diamond.ac.uk/gda/gda-epics.git into gda-8.42
correct the handling of monitor to correct data type.
Merge branch 'gda-8.42' of ssh://dascgitolite@dasc-git.diamond.ac.uk/gda/gda-epics.git into gda-8.42