added statistics server

- the game servers can (they don't have to, depends on configuration) now
  submit game information to a statistics server when the game ends
- you can run a statistics server which waits for servers to send them
  information, these information are then being updated in a database
- the clients will have to set a statistics code in their config so they
  can be identified by statserv
- the statcode needs to be inserted in the database before playing with it
adjusted gitignores