Expand support for maps for multiple marker points

[mjamescompton]

Summary

Continuing the work from issue #235 and pr #1129 expanding the support for maps to include multiple markers, and to calculate its own center based on multiple marker points.

Why do we need this?

We want to be able to show all devices on a map on the application overview page.

What is already there? What do you see now?

An array of markers are feed to the map component as a prop and a functions 'getMapCenter' is run based if the marker array length is >= 1. Currently this function just return the first marker location.

What is missing? What do you want to see?

'getMapCenter' should return the center latitude, longitude and an appropriate zoom level for the map that includes all the marker points.

Environment

console

How do you propose to implement this?

Update React component function.

Can you do this yourself and submit a Pull Request?

yes

[johanstokking]

I have to see the real world deployment where the gateway antennas as so far out that we need to show them as different markers.