Add custom Name Tags or Descriptions for Marker Waypoints.

[alkaris2]

It would be really useful if when you draw a Marker on the map for a waypoint to be able to give them a custom name tag and/or even give them a descriptor tag about what the marker objective is.

   [ Marker ]
        |
        |
         \ 
     [ Marker Name ]
            |
            |
             \ 
      [ Marker Description ]
         (140 chars limit)

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[savage13]

I think this could be quite useful, especially if you can save the marker name and description into the GeoJSON file. Looking at the code, it looks like it could be added to src/components/AppMap.ts.