Use meta key + wheel to zoom in/out (#769)

src/scene/index.ts

@@ -27,4 +27,4 @@ export {
   hasText,
 } from "./comparisons";
 export { createScene } from "./createScene";
-export { getZoomOrigin, getZoomTranslation } from "./zoom";
+export { getZoomOrigin, getZoomTranslation, getNormalizedZoom } from "./zoom";