Implement a Geo Json Component

[baldulin]

Hey, I warned you I needed more features this is currently a very simple approach to a GeoJson Component. So I would argue that one could easily merge it into the main project without creating its own package for it.

It implements the following geometries (which should be all of them):

• Point (with a svg circle)
• MultiPoint
• LineString
• MultiLineString
• Polygon
• MultiPolygon
• GeometryCollection

The features can be styled using either svgAttributes for all features, or a callback styleCallback which will also notify if a feature is hovered.

And they support the same events as the marker does, a bit copy&paste there.

I think people might need or require a lot more (popups for instance) but GeoJson is a really easy standard, and at least if someone needs more than the basic features provided here they will be able to look in a simple reference implementation and extend it themselves.

Right now the added components will be:

• GeoJson renders geojson data
• GeoJsonLoader an overly simple component that will load geojson data from an url (this is just intended for a quick & dirty solution)
• GeoJsonFeature renders a single geojson feature

Edit: Forgot to add this issue

[baldulin]

1. Can you run `prettier --write` on all the changed files? I suggest you set your IDE to do this automatically as well.

Oh that was a good hint I thought this was done by the git-hooks automatically. Also made me realize that I'm not that used to yarn to be honest.

I also forgot to run yarn build this lead to a lot of typescript bugs I had to fix. So there's some changes now. And I made the GeoJsonFeature component useful.

2. Can you also submit a PR to the pigeon-maps.js.org website repo with the new components?

Yep should be done.

[mariusandra]

Great work! Thanks for all of this and apologies for the long delay.

Version 0.21.0 released with the changes.