Add <map-tile> to support principally GeoServer layer group processing #1033
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GeoServer will soon get support for processing layer groups in "vector tile" mode. That is, layers in a layer group referenced by a GetMap request will be able to be represented as vector information, except of course for natural raster layers embedded in the group. These layers will be rendered as sequences of <map-tile row="nnn" col="nnn" zoom="nn" src="GetMap or GetTile URL to an image"></map-tile>.
Currently <map-feature> elements that are found in response to a templated request, whether for an individual tile or for a single untiled GetMap, are added in order of parsing to a templatedFeaturesLayer hosted by the <map-link> that processes them.
This PR should enable a hosted
templatedFeaturesOrTilesLayer
(name uncertain) that integrates rendering of both <map-tile> and <map-feature>.The design will evolve in the course of this PR :-)