Added a gag command.

This will silence a player's chat messages. You can either give a
specific duration in seconds or leave it blank to gag for the duration
of the map.
Fix for potentially broken randomising

Setting it to immediately shuffle teams may fail since build 241, this
should fix it.
Fixed commanders losing their mouse from the MotD

A silly oversight.
Merge pull request #46 from Person8880/develop

Build 241 Fixes