Uber chart type

This combines the different chart types into a single display, which allows preserving many options while switching between types.

As the chart types are implemented using a service that the admin and main display component refer to, it's easier to share logic/helper functions between these.

TODO:

• finish moving the AdminTrait into the unified Admin component.
• check no interference between charts using the same chart type service?
• clearer interface / hooks for chart types