* [ios, macos] Completed API for mutating multipoints
Added the complete set of methods for mutating the vertices of an MGLMultiPoint. Also rewrote MGLMultiPoint documentation to refer to vertices instead of points.
* [ios, macos] Removed inaccurate MGLOverlay commentary
This paragraph is full of references to features that exist in MKOverlay but not MGLOverlay.
* [ios, macos] Lazily compute multipoint bounds
Invalidate the bounds whenever the coordinates change, but don’t recompute the bounds until they’re requested. Simplified -intersectsOverlayBounds: for immutable overlay classes.
Added a utility function for testing whether two MGLCoordinateBounds intersect, based on mbgl::LatLngBounds::intersects().
Removed unused color conversion code.
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