Add the main multi player game request and other basic forms

Switching this issue to finish up just the basic forms and create a separate issue for the actual game play.

How to review:

1. Go to landing page /tragedy_of_the_commons.
2. Click on 'Fill out the REQUEST FORM.'
3. Fill out the request form and click 'Submit Request'.
4. Confirm you get the 'Received' email to the entered email address in the form and 'Approval Sought' email to the hardcoded emails.
5. Navigate to the link in the 'Approval Sought' email (login as needed) to review the request and confirm the Approval and Disapproval buttons display.
6. Navigate to /admin/config/development/tragedy_of_the_commons/results and confirm you see the request in a table.
7. Click on the ID or 'Last Name' links to get to the request page from step 5 with the buttons.
8. On the request page click 'DISapprove Request' to reject the request. Confirm the buttons disappear.
9. Confirm you get the 'Request Denied' email.
10. Create a new request.
11. On the request page click 'Approve Request' to approve the request. Confirm the buttons disappear.
12. Confirm you get the 'Approved' email.
13. Navigate back to /tragedy_of_the_commons.
14. Expand 'Playing the Multi-person Tragedy of the Commons game'.
15. Put in the test password from the email into the field and click 'Submit'.
16. Confirm you see a start page with 'Game for ...' text and whether it is a test or not.

Automatically closed - issue fixed for 2 weeks with no activity.