Add support for geojson & other shape formats

[kshitijpurwar]

Context

Right now, users can only access TopoJSON on Raster Playground.

Problem

Restricting the shapefile to a single format is not a great idea. Users should be able to access multiple formats on RP.

Solution

• Give access to users to use different shape formats like -
  • Geojson
  • Topojson
  • KML