Content Type Gating: Xblocks that have a graded component cannot be
accessed by audit track users.
- Caveats:
- In studio, instructors can set certain xblocks to be available to
all users, but graded components will default to not being
available for audit users
- If a course does not have a verified mode option, all users will
have access to graded content.
The Waffle Flag: The waffle flag is of for now.
It's name is: ```content_type_gating.debug```
This Commit Does NOT Include: Displaying for a user WHY they do not have
access to a specific piece of content. That change will be part of
another PR.
* Implement a ViewedEvent handling system which calls handlers when a
block has been viewed for 5 seconds (configurable).
* Hook up Verticals to register their children blocks with this event,
and submit completions once seen.
OSPR-2093
OC-3358
* Vertical marks blocks completed when viewed.
* Functionality is hidden behind a waffle switch
* Submissions from front-end are limited to known-incomplete blocks
* Upgrades xblock to version 1.1.1
* Related future requirements listed in TODO tagged with EDUCATOR-1778
and relevant opencraft OC-* ticket IDs.
OC-3088
