Yafowil.widget.datetime

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- Nothing changed yet.

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- Add support for usage in ``yafowil.widget.array`` - remove date/timepicker
related css classes ``hasDatepicker, hasTimepicker`` before initialize.
[lenadax]

- Fix case time value is no tuple in ``time_value``.
[lenadax]

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- Add ``datetime.empty_display_value`` property.
[rnix]

- Cast hour and minute values to int in ``time_value`` if ``format`` is
``tuple``.
[rnix]

- Do not mask built-in ``format`` function in ``widget`` module.
[rnix]

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- Add ``yafowil.common.generic_emptyvalue_extractor`` to ``time`` and
``datetime`` blueprints.
[rnix]

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- Python 3 compatibility.
[rnix]

- Convert doctests to unittests.
[rnix]

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- Add dedicated Plone 5 related CSS.
[rnix, 2017-03-06]

- Introduce dedicated ``timeinput_class`` and ``dateinput_class`` widget
properties. Used for CSS styling. Styling was previously bound to
``datepicker_class`` and ``timepicker_class`` class, but these are skipped
if no date and timepicker widgets should be displayed.
[rnix, 2017-03-06]

- Change default ``datetime.delimiter`` to ``.``.
[rnix, 2017-03-06]

- Change default ``datetime.format`` to ``%Y.%m.%d %H:%M``.
[rnix, 2017-03-06]