Patch for request #92

Added Round based vote:
- added option VoteafterRound
      - if 0 its disabled (default)
      - if enabled it enables also VoteonEnd to start Vote
-added value Round to count played Rounds
- if map get extended and VoteafterRound is enabled Map will extend for one Round if there are MaxOptions votes left

Hope you don't have to do so much yourself this time.