add zoomToCenter public API #82
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Adds a zoomToCenter function
zoomToCenter(1.2)Zooms in by 20%zoomToCenter(0.8)Zooms out by 20%I wanted more granular control than using the delta -1 or +1 and comparing by zoomSpeed. Especially if using this with a + or - button to zoom it makes sense to have it defined like this.