Fix the upload dialogs on the review UI pages.
Review Request #4169 — Created May 25, 2013 and submitted
Fix the upload dialogs on the review UI pages. The upload dialogs didn't contain the Django forms needed to populate the on-screen forms, due to not using make_review_request_context. This function (which hopefully we can kill in the future) has been moved into reviewboard.reviews.context (to prevent a circular dependency) and is now used in the review UI rendering code.
Tested clicking Add File when reviewing an image. The dialog no longer appeared empty.