[New Quizzes] Add RCE to Grading Notes box

[mcolucci]

Problem statement:

When adding grading keys in the grading notes box for essay question in New Quizzes, there is no way to enter anything but text. Many teachers need to be able to add formulas, diagrams, images, etc.

Proposed solution:

A simple solution would be to add a rich content editor to the grading notes box.

User role(s):

admin,instructor