MGLShape subclasses can now return NSDictionaries that represent the shapes' GeoJSON geometries. MGLFeature classes can now return NSDictionaries that represent the features as GeoJSON features. This makes it trivial to serialize iOS and macOS shapes and features into GeoJSON.
MGLFeature instances can also return a representation of themselves as an mbgl::Feature. This capability is used in a refactoring of the implementations of MGLGeoJSONSource to more efficiently transform MGLFeatures into mbgl::Features so they can be fed directly into mbgl::GeoJSONSource without having to round trip through NSJSONSerialization. The MGLFeature identifier is converted into the mbgl::identifier type based on the type of the identifier. The MGLFeature attributes are recursively converted into an mbgl::PropertyMap and each value is converted into one of the types that the PropertyMap's Value variant supports.
Moved feature selection to the context menu and restored the press gesture for dropping a pin. Bust complex features into simple shapes to feed into MGLMapView as overlays.
Added methods to MGLMapView that return the rendered features at a visible point or within a visible rectangle on the map, optionally restricted to a set of layers, plus voluminous documentation.
Added several new geometry classes corresponding to distinct geometry types supported by geometry.hpp. Added parallel “feature” classes to represent these geometries along with tags (IDs) and attributes (properties) from the source.
Grouped classes in the Foundation and SDK groups by theme.
In iosapp, dropped pins’ callout views now display the name of the topmost named feature at that point.
In osxapp, a long press on the map highlights the features under the cursor. Dropping a pin via the menu or context menu item shows the usual dropped pin, but the pin’s title is now the name of a feature under the cursor, if available, rather than “Dropped Pin”.
Fixes the iOS/OS X side of #352.
