Leaflet.Control.Layers.Tree as a plugin in folium

[vizsim]

I would love to see Leaflet.Control.Layers.Tree as a plugin in folium!
https://github.com/jjimenezshaw/Leaflet.Control.Layers.Tree

It would boost the ability to interact with mulit-layered data maps created by folium.

Nice example:
https://jjimenezshaw.github.io/Leaflet.Control.Layers.Tree/examples/airports.html

[IndigoWizard]

This PR #1592 : "add groupedlayercontrol plugin" is the closest thing to the feature so far, which comes in response to the issue #1025 : "Radio control instead of checkboxs for layer control" that requests something like Leaflet plugin leaflet-groupedlayercontrol, but it seems it's been hanging there with no new reviews or checks for merge.

[Conengmo]

#1592 was merged and will be included in the 0.14.0 release. It doesn't contain functionality for layer control trees, so we can keep this issue open.

[hansthen]

@Conengmo I can take a stab at porting this plugin to Folium. I used it in another project and I am quite fond of it. The main issue I foresee is that Leaflet.Control.Layers.Tree is configured through a javascript dictionary with functions at arbitrary locations in the tree.

Can I pilfer your tojavascript filter from the draft PR in #1856?