Zoomable/D3 images especially for correlation heatmap

[Zylatis]

Is your feature request related to a problem? Please describe. This is a fantastic summary feature but the correlation image can be unreadable with many features.

Describe the solution you'd like I suggest moving towards dynamic images such as those from mpld3 to enable zoomable images.

Describe alternatives you've considered Alternatively, a way to automatically detect text overlap in the labels on the correlation heatmap and size/resolution things accordingly so we can then extract the individual image and zoom in manually, though this is probably harder and less ideal.

[sbrugman]

Seems like a great improvement to me. Any pull request are welcome.

Specific to mpld3:

Note: mpld3 is in the process of switching maintainers: feature requests & bug reports are likely to be delayed. If you are interested in contributing to this project, please contact one of the repository owners.

A quick implementation attempt resulted in some errors, including this one.

Possible alternative: bokeh

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