Make transferred props more DRY

[adamkudrna]

Related to #86.

It would be handy to combine the definition of props to transfer with propTypes. Currently it's white-listed aside like here in Button:

  const propsToTransfer = transferProps(
    props,
    ['afterLabel', 'beforeLabel', 'block', 'clickHandler', 'disabled', 'endCorner', 'grouped', 'id',
      'label', 'labelVisibility', 'loadingIcon', 'priority', 'size', 'startCorner', 'type', 'variant'],
  );

Code could be also more DRY and easier to write and maintain then.