Document map configuration options

[joewdavies]

They were in V2 and have now dissappeared, e.g.:

  selectionRectangleWidthPix: () => "1",
  onZoomStartFun: (event) => {
    console.log("pan/zoom start", event);
  },
  onZoomFun: (event) => {
    console.log("zoom", event);
  },
  onZoomEndFun: (event) => {
    console.log("pan/zoom end", event);
  },

No mention in the docs or in the changelog.

[joewdavies]

Fixed with cccf95c