XPublish OGC Core

Enable Xpublish plugins that support various OGC methods to serve via fully OGC compliant routes.

Currently it's a very alpha way to demo how we could do this. You have been warned.

This works by creating an app_router that responds to more general OGC endpoints like /collections, /collections/{collection_id} with eventually compliant responses.

It also registers new hookspecs that other plugins can implement.

• ogc_router which allows adding to any OGC route (probably should add an ogc_collections_router to be more specific).
• ogc_collection_dataqueries that allows each plugin to advertise their routes in a /collections/{collection_id} response.