[w3c/uievents] Mark up IDL attributes properly (#110)

Right now there is no connected between the definition of e.g. MouseEvent's ctrlKey, and the IDL. This requires some Bikeshed tricks: instead of

```html
<dt>MouseEvent . ctrlKey</dt>
```

write

```html
<dt><dfn attribute for="MouseEvent">ctrlKey</dfn></dt>
```

(Also please don't use the InterfaceName.attributeName notation.)

This makes it easier for other specs to link to you, and will avoid the accidental linking to CSSOM that is done for screenX and friends.

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