[CHD-3513] [Aesthetics] Fixed an issue where the search menu disappeared behind the 'hints' popup of Quick Search.
* [Devblocks/Workspaces/Charts/Plugin Development] The Devblocks HTML5 charting library now mediates all mouse interaction with the charts. Listeners can bind to 'devblocks-chart-click' or 'devblocks-chart-mouseover' to receive updates about user input.  The returned event includes information about the closest data point to the mouse cursor, including chart coordinates.  This saves the caller a lot of work when designing interactive charting elements.

* [Workspaces/Dashboards/Line Charts] Line chart dashboard widgets now display a horizontal line through the selected data point to make lateral comparisons easier.

* [Workspaces/Dashboards/Scatterplots] Scatterplot dashboard widgets now display crosshairs that intersect at the selected data point. This makes comparisons easier in both dimensions by creating quadrants.

* [Workspaces/Dashboards/Gauges] Gauge dashboard widgets now display their labels below the widget for uniformity.
* [Virtual Attendants/Variables/Lists] When a Virtual Attendant behavior has a list variable, the resulting worklist view_id will now be saved in the dictionary in the format 'var_name_view_id'.  This allows reuse of the underlying worklist for all kinds of functionality.  Notably, it's currently used to send worklists to the mobile app.  It could also overcome the 100 object limit of list variables now.
6.5-dev checkpoint