Remove game_maintainance.php
Remove game_maintainance.php

This admin tool is unused, only partially implemented, and probably
not useful to anyone anymore, so just remove it. (It also seems to
re-implement some functionality of mysqldump.)

smrealms/smr,hemberger/smr,hemberger/smr,smrealms/smr,hemberger/smr,hemberger/smr,smrealms/smr