Zope.app.pagetemplate

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- Fixed the `zope.browserpage` imports in the ``namedtemplate`` module.

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- Moved named template implementation to zope.browserpage.

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- Moved viewpagetemplatefile, simpleviewclass and metaconfigure.registerType
into the zope.browserpage package, reversing the dependency.

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- Refactored nested macro test from a functional test into a unit test. This
allowed to remove the last outside zope.app dependencies.

- Fixed undeclared testing dependency on zope.app.component.

- Copy trivial NoTraverser class from zope.app.publication to avoid a ZCML
dependency on that package.

- Correct testing dependency to point to zope.securitypolicy instead of its
zope.app variant. The app version is no longer required since 3.4.1.

- Removed the ``inline-evaluation`` extra referring to zope.app.interpreter.
There's no code or ZCML left pointing to that package.

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- Restored ``zope.app.pagetemplate.engine`` module, using BBB imports from
``zope.pagetemplate.engine``.

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- Moved the ``engine`` module and associated testing machinery to
``zope.pagetemplate`` (version 3.5.0).