A few small improvements

- AFK kicker can now be set to only check players when a game has
started.
- The ready room plugin will remember the team players ended the last
round on and, if possible, place them on the opposite team if they are
forced next round.
- The welcome messages plugin should no longer display a disconnect
message for a player who has not had a connect message displayed.
Merge pull request #120 from Person8880/develop

A few small improvements