New trace types incoming: funnel and funnelarea

funnel is a lot like bar and funnelarea is a lot like pie. Both should be quite easy to add support for.

@angeladaodao we will need icons for both please. Ask @archmoj to provide sample graphics for what they each look like.

[nicolaskruchten]

Perfect, you rock @angeladaodao ! Please provide the SVGs to @VeraZab as per usual process and she can roll them into the icons repo and we can do the implementation

[archmoj]

Here is a codepen.