Switch all blocks to exposing props.

[tcmulder]

10up does the following, which is smart, if a little more verbose:

const ExampleBlockEdit = (props) => {
  const { attributes, setAttributes } = props;
  const { thing } = attributes;
}

It would allow me to console log all props, which would be very convenient. It'd also separate the props being used from the function declaration, which would reduce line length red squiglies from the linter :-)