Z3c-form

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- move js to separate file to prevent escaped entities in Plone 5.
[pbauer]

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- Add DataExtractedEvent, which is thrown after data and errors are extracted
from widgets. Fixes https://github.com/zopefoundation/z3c.form/pull/18

- Remove spaces at start and end of text field values.

- Explicitly hide span in ``orderedselect_input.pt``. This only
contains hidden inputs, but Internet Explorer 10 was showing them
anyway. Fixes https://github.com/zopefoundation/z3c.form/issues/19

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- Feature: Added text and password widget HTML5 attributes required by
plone.login.

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- Feature: Added a consistent id on single checkbox and multi checkbox
widgets.

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- Feature: Added a consistent id on ordered selection widget.

- Feature: Added a hidden template for the textlines widget.

- Feature: added an API to render each radio button separately.

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- Bug: Remove errors for cases where the key field of a dict field uses a
sequence widget (most notably choices). The sequence widget always returns
lists as widget values, which are not hashable. We convert those lists to
tuples now within the dict support.