Add debug mode to inspect scales and bounding box

[mhkeller]

This feature makes it easy to check whether the scales picked up the right domain and range. You add debug={true} to the component and it prints out info about the container and all active scales. Would any other things be helpful to add?

Here's a preview of the console output

[mhkeller]

It would be cool if hex codes appeared as their color.

A quick test: