Zope-app-component

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- Import hooks functionality from zope.component after it was moved there from
zope.site.

- Import ISite and IPossibleSite from zope.component after they were moved
there from zope.location. This lifts the direct dependency on zope.location.

- Fix tests using a newer zope.publisher that requires zope.login.

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- Removed unnecessary dependency on ``zope.app.interface``.

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- Fix missing import in ``zope.app.component.metadirectives``.

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- Add deprecation note.

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- IMPORTANT: this package is now empty except for some ZMI definitions
in zope.app.component.browser. Functionality from this package has
been moved to ``zope.site``, ``zope.componentvocabulary`` and
``zope.component``, so preferably import from those locations.

- zope.componentvocabulary has the vocabulary implementations that
were in zope.app.componentvocabulary now, import them from there for
backwards compatibility.

- moved zope:resource and zope:view directive implementation and tests
over into zope.component [zcml].

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- Removed deprecated `zope:defaultView` directive and its
implementation. New directive to set default view is
`browser:defaultView`.