Collective.searchandreplace

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- Nothing changed yet.

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- Depend on z3c.form instead of zope.formlib
[gotcha]

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- Test on GitHub Actions on Plone 4.3-6.0. [gotcha]

- Fix isDefaultPage moved to a different interface module.
[Rudd-O]

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- Fix the title of the action category disappearing (and displaying ``object`` instead) when installing this addon.
[Rudd-O]

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- Do not show "Replace" button until user has seen Preview results.
[gotcha]

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- Made "Find What" field required and allow empty "Replace With".
Fixes `issue 43 <https://github.com/collective/collective.searchandreplace/issues/43>`_.
[spereverde]