enhancing dhtml view with some simple collapse/expand toggles

This commit marks my initial exploration into adding some basic collapse/expand toggles to the DHTML pickled view so as to better manage feature pages with lots of content.

- clicking on scenario background and scenario titles now toggles the visibility of related content;

- clicking on table headers now toggles the visibility of the table rows;

- show all / hide all tools show and hide scenario details across the page;

I am not attached to this set of interactions nor to the implementation, but wanted to illustrate the type of enhancements I'm interested in.