Missing event logs for registration-related actions and layout changes

[OmeGak]

Is your feature request related to a problem? Please describe.
Some management actions in events fail to produce report logs. In particular, I'm missing:

• [re]opening/closing a registration form
• approving/rejecting a registration
• checking-in a registrant
• resetting check-in for a registrant
• updating the event layout

Describe the solution you'd like
Let's simply log these actions.