GitLab

fixes FOO-1409
flag  = none

no more client_apps, canvas_quizzes now lives as part of canvas-lms
proper inside app/jsx/, which makes the build leaner and leaves us with
one less thing to reason about

logical changes:

- converted from AMD to ES modules
- upgraded to recent react + react-router
- dropped RSVP in favor of native Promises
- used CanvasModal instead of home-grown Dialog
- removed dead code; notifications in particular were fishy as there had
  no dependents at all and did not even show up in the graph
- ported tests to Jest, added more unit ones and two integration ones
- removed "config.onError" and now throws errors where appropriate
- disabled console statements in non-dev

:: test plan ::

- create a (old-school) quiz containing all types of questions
- as 3 distinct students, take the quiz and try to randomize your
  answers

at this point it's helpful to have a reference to compare the screens; I
replicated the quiz on my production sandbox for this

- go to /c...