Event Manager Control

Admins can now:
Pause event start countdown.
Add/Remove events to rotation.
Affect the likelihood of events occurring.
Allow one shot events to fire again.

Remaining
-[ ] Add admin logs to prevent sneaky edits and abuse.

![Main Page](https://www.dropbox.com/s/45f53z5em4fm3pp/EventMain.png?dl=1)
![Rotation Page](https://www.dropbox.com/s/tj5vn30avkycvkq/EventSecond.png?dl=1)