sublime fields

Creates a small image of a field's entire contents which scrolls in sync with the field.

This creates fields similar to the fields in the SublimeText Code Editor.

When 'sublimeField Behavior' is attached to a field a small image of the field's entire contents will be created and placed in a group to the right of the field.

As the field scrolls the smaller version will scroll in sync.
When the number of lines in the field change the small version is updated to match.

The size ratio of the small image to the field is determined by the kPercentShrink constant in the behavior script.

- Jim Lambert 2022