Ability to restrict who can switch to a server
Server switcher now has an entry in the vote menu

When a player opens the vote menu, the server will send the current list
of servers to switch to. If a server in the plugin has the flag
"UsersOnly": true, then it will only be sent to registered users. If a
player has no servers sent, the button will never show.
A bit less of a dumb method

for adding to the vote menu's functionality.
Option to force random teams permanently

Will shuffle the teams once the game is about to start, ignoring
commanders.
Merge pull request #125 from Person8880/develop

Server switch and vote random additions