GPII-364: Created conditional panels for "Add contrast".
Also gave a default value to contrastTheme "bw".
GPII-365: Created conditional panels for "Increase size".
GPII-365: Implemented hiding of Magnifier extra adjusters.
Only "more/less" is left out of expansion.
GPII-365: Showing/hiding more/less of magnifier.
Could not get magnifierEnabled value here through protoTree, so this behavior is DOM dependent on an element existing in a sub-panel.
GPII-365: Showing/hiding more/less of magnifier model-bound.
Only slight issue is that i have to replace "." with "_"in preference name.