Display submission deadline in template, not problem deadline.

Hide formatted due date in submission if it's not provided

Updating the Assessment Models

Fix TIM-381: Invisible Self Assessment errors

* Corrects bad div class
* Adds tests to catch this in future

FIX - Inline Error Message Display

* aligning text to be left-justified
* adjusting color of paragraph copy to inherit from parent
* moving all message styling to _system-feedback.scss partial

FIX - Staff Info UI Title Display

FIX - TIM-408

FIX - TIM-344

Add datadog instrumentation

Make Google font URLs work under HTTPS

Add more info to manually created scoring analytics event.

Prevent duplicate submissions on client side by disabling submit button

Allow Criteria and CriterionOption name changes

Validation check for duplicate criteria and options

Change config key from EDX_TIM to EDX_ORA2

Hide course staff debug info in studio preview

Show item_id (location) in Course Staff Debug section.

It's cumbersome to get otherwise, and staff will want it for state
resetting (if it comes to that).

No longer supports re-ordering of options and criteria, but allows name change.

Add event and INFO level logging.

This introduces a few features:
* INFO level logging on common events like creating or fetching
  submissions and assessments.
* Parallel event logging for the same.
* Creates a local logs/ directory for development.

For the most part, we rely on XBlock's publish() mechanism to emit
event data. However, because scoring is done at the API layer in a way
that is not directly visible to the OpenAssesmentBlock, we're logging
that event separately with a hacky solution that dynamically loads an
emit function based on a configuration value. This is a stopgap
measure until we can start using the edX analytics API (which is still
in testing).

TIM-260, TIM-378

Course staff can see counts

Change scenario due date to be in the future and minor changes to prompt text.

Revert setup.py name change back to ora2