Moved mbgl::util::default_styles to a more appropriate location, where iOS platform code can also find it. Moved -[MGLMapView bundledStyleURLs] (which is now deprecated) and the style switcher in iosapp to default_styles.
Added a collection of convenience methods for getting style URLs. It makes little sense to layer an enum atop this, as MapKit does, because MGLMapView styles aren’t limited to this set. A good analogy is UIColor. This also makes for a good entry point for future runtime styling APIs.
Introduced independent constants for each default style, because it’s more common to need access to a particular style than to iterate over them. This fact is apparent in the MGLStyle class, which now uses macros and assertions to ensure that it’s kept up-to-date with changes in default_styles.
/ref #1462
Plumbed camera options all the way through to MGLMapView. Added a method that lets you specify a direction in addition to center point and zoom level.
Added Map::jumpTo() for parity with mapbox-gl-js. Replaced usage of Map::setLatLng() and Map::setLatLngZoom() with Map::jumpTo() or Map::easeTo() within MGLMapView. Replaced MGLMapView.pitch with MGLMapCamera for setting all supported degrees of freedom simultaneously. Simultaneously move and rotate with course.
Support customizable timing functions on iOS.
iosapp now persists an archived MGLMapCamera instead of separate viewpoint properties and also synchronizes user defaults on termination. This change implements persistence entirely in Objective-C, eliminating the use of the Objective-C++ implementation.
Fixes#1643, fixes#1834. Ref #1581.
