Add missing server dependencies to Travis metadata

Write down system requirements

Fix typo in gameServer

Space Invasion: Add hilarious loser face to losers

Space Invasion: Continue playing rounds in case the teams are tied at the end Rules in case of a tie: 1) Eliminate all teams not tied for the lead 2) Play another round with the remaining teams 3) Check for the winner again at the end of that round. If there's another tie, repeat the procedure

Space Invasion: refactor variables into a large table for everything To fix that annoying "upvalue" error if more variables are added

Remove frontend code dealing with unused team variables

Replace now-outdated descriptions of amDuck with dummy texts

GameServer: Use consistent formatting of clan chat (compared with engine) It's called "clan chat" now, not "team chat". Also the brackets and text positions were inconsistent with engine.

Change empty string check in gameServer

/greeting chat commands now clears greeting if called w/o arguments

Add a couple of more useful server messages

Don't translate greeting message

Don't translate response to /rnd command

Add error message for /callvote map if no maps are available