This commit upgrade storybook to 5.2.8 and adds the Docs addon to better document our stories. It also includes some storybook speedups. The Docs addon will be used on a different PR that will move the prop tables and the source to that addon.

close #457

This commit fix the issue with the recursive loop created when feeding chart with its own cursor position.

BREAKING CHANGE: The `onCursorUpdate` Settings property is changed to a more generic
`onPointerUpdate`. The same apply for the event type `CursorEvent` that is now `PointerEvent` and can assume a `PointerOverEvent` or `PointOutEvent` shape (see TS types)

fix #504

# [16.0.0](v15.0.5...v16.0.0) (2020-01-02)

### Bug Fixes

* **external pointer:** avoid recursive-loops on pointer events ([#503](#503)) ([c170f0d](c170f0d)), closes [#504](#504)

### BREAKING CHANGES

* **external pointer:** The `onCursorUpdate` Settings property is changed to a more generic
`onPointerUpdate`. The same apply for the event type `CursorEvent` that is now `PointerEvent` and can assume a `PointerOverEvent` or `PointOutEvent` shape (see TS types)