Horizontal scroll bar for really long structure heading labels #675

Description

When there are really long labels for sections in the structures, Ramp's StructuredNavigation component creates a horizontal scroll-bar.

Example structure

From avalon-dev: https://avalon-dev.dlib.indiana.edu/media_objects/mw22v546v

Done Looks Like

• No horizontal scroll-bar is present in StructuredNavigation component
• Wrap the label into new lines to fit the width of the structure container

Notes

• When spaces are present in the string, wrapping with newlines is already taken care of
  Related work: Truncate label #674