* [ios] Adds the ability to customize map deceleration speed
* [ios] Made pinch, rotation deceleration adjustable too
Drift zooming and drift rotation also respect the deceleration rate. A side effect of this change is that drift zooming will come to a stop ever-so-slightly sooner now.
* [ios] Documented deceleration rates
Added documentation for deceleration rate constants. Also updated the changelog.
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