* remove data from event handler signatures
* standardize known transfer types
* add setEventTransfer to docs
* update examples, fix drag/drop
* fix tests and draggable attribute setting
* Allow React 16 in peerDeps and use it for dev
* Make tests pass with React 16
Changes are cosmetic:
- React 16 no longer adds a trailing `;` to `style` attributes
- React 16 outputs `0` and not `0px` for sizes in `style`
* Reshape void component structure.
Get rid of offscreen spacer.
* Polish Embeds example `Video` component.
* Fix oversight.
* Force spacer width to be 0.
* Update tests