Make updates for colour scheme
Rename updateColourScheme for ease of debugging
Ensure colour scheme combo gets updated when activate is called
Defensively call deactivate and ensure paletteData is null to avoid caching issues
Set palettedata without using cached value to avoid bugs with dedicated view
Ensure RGB combos get updated correctly
Fix bug to make histo-range and b&c update when roi changes
Ensure updates happen for brightness, contrast and histogram range ux
Code clean up & commenting
Change order of events as workaround for lack of notification for pallette name changing.
Merge Colour Mapping Usability Fixes branch to master