Event Manager Control

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