Pmr2.oauth

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* Ensure the tests work with plone.protect>=3, and bumped dependencies.

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* Usability enhancements; reworded the user facing form and added a user
action for easier linkage to their approved applications.
* Updated dependency to oauthlib>=1.0.2.

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* Bug Fix: Corrected the handling of application/x-www-form-urlencoded
for the signature verification. [PMR/pmr2.oauth4]

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* Updated the supported oauthlib to 0.6.0
* The design has been refactored to rely on the token endpoint classes
for the validation.
* Support OAuth requests encoded using URL query strings.
* Addition of new content types into portal should no longer result in
z3c.form-3.0.0 breaking on <NO_VALUE>.
* Updated a large amounts of text and even an internal management
endpoint to be more clear and reflective of the terminology used in
RFC 5849.
* More usability fixes. The entire management interface should now be
easily accessible through the Site Setup menu, and also the inner
management pages should link back to the main OAuth management page.

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* Removed deprecated imports from zope.app.*.

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* URL encoding/decoding workaround to ensure the query parameters are
being processed correctly.
* Bug fix: Deleting a client (consumer) no longer prevents user from
managing their list of issued tokens.
* Depends on oauthlib 0.4.0

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