HTML5 date, time and datetime input types

Support for these input element types:

<input type="datetime"...>
<input type="date"...>
<input type="time" ...>

On mobile platforms, QtWebKit should enable the user to bring up the platform's date, time or date and time picker widgets. On desktop platforms, we should use Qt's time and date widgets. It should also be possible to edit the textual representation of the date, time or datetime.