concordanceNavigator: set measure interval

[riedde]

It would be nice, if the interval setting for the measureBased view could be changed at the concordance navigator.

Use case: I had a question concerning a hairpin and needed to see the next measure. It wasn't easy because of many sources and pagebreaks.

[bwbohl]

Should the individual setting on one source window still be available? What do you think? If so, we should come up with a precedence behaviour. Maybe the setting on the individual source could be greyed out and reflect the concordanceNavigator setting and off a tickbox for "manual override" that would activate the controls (un-grey them) and then listen to those settings when navigating.

[nikobeer]

Maybe better to keep it simple. Like the global tools for annotations and measure labels: global ConcNav overrides "local" interval preselections -> single "local" override global concNav preselections.

[nikobeer]

Hidden icons/buttons is more a basic UI problem of object windows.