Add a confirmation step after signup to accept T&C's

[ffdixon]

When a new user creates an account on GreenLight, regardless of the authentication method, add a last step in the registration process to

1. Validate their email
2. Get acceptance of the site's Terms and Conditions (T&C's) and have read the privacy policy.
3. Subscribe to email notifications on new features and help (optimal)

After the user creates an account, the steps would be

1. GreenLight will send a confirmation message (from a template) to the email address provided by the user.

The email has the title "Activate your GreenLight account" with the body "Click this link to activate your account"

2. The user clicks the link

The link opens a page on the GreenLight server. The page (from a template) shows an T&C Acceptance page

This is the last step to setup your account on GreenLight.

[ ] I Accept the Terms and Conditions and have read the Privacy Agreement
[ ] Send me infrequent updates via email on new features and how to use BigBlueButton (optional)

(Submit)

3. The checks the first, optimally the second, and selects Submit.

The user is redirected to the Greenlight

If the user does not accept the T&C's, then they are unable to proceed further.

For existing accounts, if the use has used GreenLight before this feature is implemented, after they login they will get the above T&C Acceptance page and cannot proceed further unless the accept the Terms and Conditions.