Allow integrators more control over chart configuration

[darh]

Following is set of ideas for chart configuration improvements from the top of my head.

I want users to be able to at least edit the JSON of the settings and manually use all eChart capabilities.

• [ ] Option to see edit JSON version of whole eChart's setting object or parts of it

• [ ] Allow users to decide what to use for data labels to avoid overlapping

  • [ ] nothing
  • [ ] value
  • [ ] label

• [ ] Positioning of chart and legend

  • [ ] allow the legend to be hidden (show: false) or plain (type: plain; default), scrollable (type: scroll)
  • [ ] allow setting of left/top values

• [ ] Bar chart label

  • [ ] position: ....
  • [ ] overflow / ellipsis

• [ ] Tooltip settings

  • [ ] show/hide
  • [ ] formatted / valueFormatter

• [ ] Option to generate a chart with random data (each new load/refresh of chart uses a new set of random data)

  • [ ] use "subtext" to show "Generated random data"

Example of unreadable output due to wrong default settings.

[darh]

This was partially covered in #537. Will address the rest later.

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