Pull markers out into separate repo/plugin about esri-leaflet-renderers

[patrickarlt]

It might sound kinda excessive but I think each one should be a separate library just namespaced under Leaflet.

• Leaflet.SquareMarker
• Leaflet.CrossMarker
• Leaflet.XMarker
• Leaflet.DiamondMarker

I'm going off https://github.com/jdfergason/Leaflet.Ellipse as an example.

[kneemer]

Sounds good, I noticed that they added a triangle marker in 10.1(?) so I can add that while I'm at it.

[kneemer]

@patrickarlt - I created these in my repo for now with package.json files so that I could get them with npm. I then included them in my build process but it seemed weird to reference them within the node_modules folder. Is there a better way to do this?

[kneemer]

The markers had so much shared code that I put them into one repo with a base class of the shared code and each marker is just responsible for the svg and canvas drawing.

[kneemer]

Done for leaflet-1.0