Zope-app-component

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- Nothing changed yet.

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- Remove test dependencies on zope.app.testing, zope.app.zcmlfiles,
and others.

- Remove install dependency on zope.app.form, replaced with direct
imports of zope.formlib.

- Simplify ``zope.app.component.testing`` to remove the deprecated or
broken functionality in ``testingNextUtility`` and
``SiteManagerStub``. ``PlacefulSetup`` is retained (and incorporates
much of what was previously inherited from ``zope.app.testing``),
although use of ``zope.component.testing.PlacelessSetup`` is
suggested when possible.

- Add support for PyPy and Python 3.4, 3.5 and 3.6.

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- Replaced an undeclared test dependency on ``zope.app.authentication`` with
``zope.password``.

- Removed unneeded dependencies.

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- Replaced a testing dependency on ``zope.app.securitypolicy`` with one on
``zope.securitypolicy``.

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- No longer using deprecated ``zope.testing.doctest``. Use python's build-in
``doctest`` instead.

- Replaced the dependency on ``zope.deferredimport`` with BBB imports.

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- Added missing BBB import in ``zope.app.component.metaconfigure``.

- Requiring at least ``zope.component`` 3.8 where some modules have
moved which are BBB imported here.