Added presence and payment status to registration details page

Closes #628 (closed)

Short description

Added a presence indicator to the registration details page.

Steps to use this feature

1. Create an event which requires a registration.
2. Register for the event.
3. Wait until the event has begun.
4. Notice that the presence indicator says that you are not present.
5. Set the presence check for your registration.
6. Notice that the presence indicator says that you are present.