And remove Leaflet.Toolbar dependency.
This also teach ContextMenu how to display icons instead of
text and how to render in horizontal orientation instead of
vertical.
This mainly allows to dynamically load the third party libraries.
In the same process, those libs have changed:
- tokml => switch to placemarkio fork, more up to date and available
as ESM
- togpx => switch to geojson-to-gpx, more up to date and available as
ESM (note: this lib does not export polygons, because they do not
make sense in GPX world, while the previous was converting them as
lines before)
Fix up for 2c1cd46167
We keep the `.mjs` fragment within the filename to avoid changing it manually within the renamed `purify.es.js` file. Given the `.map` extension, it will not affect the nginx (or others) mimetypes configuration.
It requires a special nginx configuration that we want to avoid for all instances deployments:
```
include mime.types;
types {
application/javascript mjs;
}
```
simple-statistics has a few advantages:
- faster
- more accurate kmeans algo
- Jenks-Fisher algo
Also, I suspect will use it again for next step, which is Bubble
mode layer.
