Zope-app-component

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- Make ``class`` directive schemas importable from old location,
raising a deprecation warning. It was moved in the previous release,
but some custom directives could possibly use its schemas.

- Deprecate import of ClassDirective to announce about new location.

- Change package's mailing list address to zope-dev at zope.org,
because zope3-dev at zope.org is now retired.

- Adapt to the move of IDefaultViewName from zope.component.interfaces
to zope.publisher.interfaces.

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- Moved the implementation of the <class> directive from this package to
`zope.security`. In particular, the module
`zope.app.component.contentdirective` has moved to
`zope.security.metaconfigure`, and a compatibility import has been
left in its place.

- Extracted `zope.site` from zope.app.component with backwards
compatibility imports in place. Local site related functionality
is now in `zope.site` and packages should import from there.

- Remove more deprecated on 3.5 code:

* zope.app.component.fields module that was pointing to the
removed back35's LayerField.
* zope.app.component.interface module that was moved to
zope.component.interface ages ago.
* zope:content and zope:localUtility directives.
* zope:factory directive.
* deprecated imports in zope.component.metaconfigure
* browser:tool directive and all zope.component.browser
meta.zcml stuff.

- Remove "back35" extras_require as it doesn't make
any sense now.

- Remove zope.modulealias test dependency as it is
not used anywhere.

- Deprecate ISite and IPossibleSite imports from
zope.app.component.interfaces. They were moved
to zope.location.interfaces ages ago. Fix imports
in zope.app.component itself.

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- Remove deprecated code slated for removal on 3.5.

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- Resolve ``ZopeSecurityPolicy`` deprecation warning.

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- Initial release independent of the main Zope tree.