Use gradients and rounded corner for bar graphs

[#44616153]

To match Upstatement design, work in progress.
Add .get() method to interactive controller

It can be used to get any property from interactive JSON definition.
Enable "export data" button when variables are filled in

... even when no data has yet been collected.
Disable the metadata fields until the sensor applet is ready
Better handling of enabling/disabling buttons when exporting
Clear metadata after export
IS Global Climate version 9d
Added GA event for starting an interactive
updated about text for diffusion (and protein folding) interactives

[#47400721]
fix error when GA configuration not enabled

IMA: [#46994677]
cancel axis rescale if automatic shift under way

[#46245869]