Allow maximisation of each chart in panel

[danbraunai]

In the corner of each chart, we could have a button which allows the user to maximise that chart. After pressing, all the other charts would disappear and the selected chart would take up the size of the whole panel, making it much clearer.

For the cases where we have 3 charts in a single row, we may want to increase the vertical space when the user maximises a chart (otherwise the chart wouldn't actually increase in size).

[leesharkey]

I think this is maybe worth doing for important panels, but it might not be necessary for any. This is maybe something that we could decide to implement after user feedback, or at least after we've got a fully functioning draft of the paper/webpage.