Admin Notices

Lets admins set temporary notices that will last until the end of the round.
* All players that join the server will see this notice.
* Anyone can check it using the Adminnotice verb
* Also adds the motd verb that can be used to check the server's message of the day

The intention of this is to make it easier for admins and server hosts to run special events.
Input window will now have the current admin notice displayed when you go edit it.
Merge pull request #1970 from Ikarrus/adminnotice

Admin Notices