Add fields to Scenario

[alexandroidii]

• Add a Reviewer foreign key to the scenario to show who is reviewing it

• Add a Submitter foreign key for the user that submitted the scenario

• Add a Published/Public/reviewed Boolean that would show the scenario is approved and is publicly searchable.

• Possible Parent ID of the original Scenario if we go with option 2.a for editing scenarios. this is where the original scenario is kept for auditing but a new scenario is created for each edit.

[alexandroidii]

This has been implemented.