right click menu item includes <<trace>>
A right-click menu option exists to display the variable's value, but we don't
have a way to pull this data from the backend yet.
Right now clicking 'Add trace' after right-clicking on a variable will cause the
variable to appear in the right-bottom pane of the source window.
However all this data is fudged pending the back-end functionality
This has been implemented via a right-click menu that presents the user with an
option to add the variable to the variable watch view if it has not been added
or delete the variable if it is already in the window.