[Tile-serving] [mod_tile] UTFGrid support for mod_tile (#58)

[Mikel Maron]

@apmon yes I plan to work on this soon, and would really appreciate help.

The variables for a UTFGrid are the layer, fields, and templates for teaser and full. The templates are not actually served in the grids, but defined in application javascript typically, so renderd/mapnik only needs to be aware of the layer and fields. Options I can think of would be to extend mapnik XML config to define these, or to add the definitions to renderd.conf.

My preference right now is to build this support into renderd as you suggest, and the config into renderd.conf as well, so we can build this feature without dependency on a mapnik release. If mapnik later supported UTFGrid output directly, then renderd can update.

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https://github.com/openstreetmap/mod_tile/issues/58#issuecomment-31217341
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