Simulator GUI: Expand or collapse tables on the activity page

As a user of the simulator GUI I would like to be able to expand and collapse the tables displayed on the activity page (parameters, actions and messages) so that it is easy to zoom in to a particular table of interest without having to scroll down through multiple pages to find what I'm interested in.
For particularly complex simulator scenarios this is even more important.

Start by locating the simulator GUI's activity page and the tables for parameters, actions, and messages. Read how those tables are rendered, then verify that each can be expanded or collapsed independently and that complex scenarios no longer require scrolling through every table.

Written by the indexing model from the issue text.