Adjustments ins Communication

The name-String of each team is safe to have 5 characters now.
If the provided name was shorter, "x" is appended until the name has 5
characters. If the name was longer, it was cut of after the 5th letter.

Further, the teams average reaction times are now beeing logged and used
to kick the team out, if it's reactions are to slow in average.

The timeout times are now declared as final variables at the top of
Communication.