Extract plugins Infrastructure from edx-platform
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Status
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Accepted

Context
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We have experimented with adding plugins to edx-platform and are now ready to move this functionality to other IDAs. However, the django app plugins infrastructure is currently located in edx-platform and thus not easily usable by IDAs.

This Django App Plugin functionality allows for Django-framework code to be
encapsulated within each Django app, rather than having a monolith Project that
is aware of the details of its Django apps.

Decision
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Move plugin infrastructure to edx-django-utils.

.. note:: Currently, we've decided this plugin enablement code doesn't warrant its own repository.

Consequences
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Fix all links to this code in edx-platform.