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LEARNER-1894 This commit adds in course messaging for three use cases. First, when the user is not signed in, the user is shown a message that provides a link to sign in or register. If the user is signed in but not enrolled, they are given a link to do so. If the user is enrolled but the course has not yet started, they are shown a message explaining when the course starts and shown a link (not yet enabled) to add a reminder to their calendar. The implementation defines a base message class and extends it for the course home messages as well as the previously implemented page level messages.
Open EdX Features ----------------- This is the root package for Open edX features that extend the edX platform. The intention is that these features would ideally live in an external repository, but for now they live in edx-platform but are cleanly modularized.