[openstreetmap/openstreetmap-website] Dragging routing icons does not work in IE/Edge (#1343)

[Petr Kadlec]

In Internet Explorer 11, the routing icons cannot be dragged, it does not work at all. In Edge, the dragging seems to work, but the “to” icon is dropped always, even though the “from” icon was dragged.

Both issues come from a wrong implementation of the drag&drop code in OSM (plus worse compatibility of IE, obviously): The first argument to `DataTransfer.setData` is not some data subkey (like `$().data()` works), it is `format` (see [MDN](https://developer.mozilla.org/en-US/docs/Web/API/DataTransfer/setData) and [WhatWG](https://html.spec.whatwg.org/multipage/interaction.html#dom-datatransfer-setdata)) And IE explicitly supports only two formats: `text` and `URL` (see [MSDN](https://msdn.microsoft.com/en-us/library/ms536744.aspx)), so we need to use one of them (probably `text`) and do our own subkeying under that, if needed. (It might make sense to separate drag&drop handling to some library to cover this compatibility stuff, should drag&drop get used more in OSM.)

Also, IE does not support `.setDragImage` (see [CanIUse](http://caniuse.com/#feat=dragndrop)), so we need to conditionalize that.

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