Support HTML axis labels for cartesian charts (BarChart, LineChart, etc) #465

While the Text component has some support for wrapping (and soon truncation), HTML layers is more adept for laying out text. We should investigate easily switching to HTML rendered text for simplified charts (BarChart, LineChart, etc)

• Update Text to support <Html> layers (Update primitives to support <Html> render context (when applicable) #408)
• Update Axis to at least rendering labels/Text, although Rules/Lines could also easily be supported ((Update primitives to support <Html> render context (when applicable) #408))