Add support for Materia widgets in assessments.

[FrenjaminBanklin]

THIS BRANCH HAS A MIGRATION.

Closes #1772.

Adds Materia chunk score verification and displaying highest scores via LTI passback in the viewer.

Adds Materia as a type option for questions.

Also adds support for displaying partial credit in assessment reviews. This is sort of approaching #545, but will likely need some more tuning to fully address MC questions.

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