TimeLimit

• First version of TimeLimit.
• The cvar prs_time_max determines how many minutes of gameplay should pass before a vote is called.  Only time spent in a round is counted; time between rounds is not.
• The cvar prs_time_vote determines how long players have to cast their vote in seconds.
• After the vote is complete, the server will change to the map with the most votes.  If no-one voted, or there is a tie, then the current map will continue and the vote will not happen again.
• Players can force a map vote at any time by typing "prs_mapvote" in the console.
• The list of maps is held in the ns/namevotemaps.txt file.  This should contain a list of maps without the .bp extension, one per line.  For example:
  ns_bast
  ns_nancy
  ns_eclipse
  ns_whatever
• The plugin will choose five maps randomly from the list.  Note: the plugin only supports a maximum of 50 maps.
  
• The cvar prs_time_version can be used to filter servers running this plugin in game browsers.