Zope.locking

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- Nothing changed yet.

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- Fix DeprecationWarnings for ObjectEvent.

- Add support for Python 3.7 and 3.8.

- Drop support for Python 3.3 and 3.4.

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- Python 3 compatibility.

- Note: The browser views and related code where removed. You need to provide
those in application-level code now.

- Package the zcml files.

- Updated dependencies.

- Revived from svn.zope.org

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- Consolidate duplicate evolution code.

- Split generations config into its own zcml file.

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- Bug fix: the generation added in 1.2 did not properly clean up
expired tokens, and could leave the token utility in an inconsistent
state.

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- Bug fix: tokens were stored in a manner that prevented them from
being cleaned up properly in the utility's _principal_ids mapping.
Make zope.locking.tokens.Token orderable to fix this, as tokens
are stored as keys in BTrees.

- Add a zope.app.generations Schema Manager to clean up any lingering
tokens due to this bug. Token utilities not accessible through the
component registry can be cleaned up manually with
zope.locking.generations.fix_token_utility.

- TokenUtility's register method will now add the token to the utility's
database connection if the token provides IPersistent.

- Clean up the tests and docs and move some common code to testing.py.

- Fix some missing imports.