Added ForceMapvote and ForceMapvoteAtRoundEnd

Added those values to options:

ForceMapvote: Starts a Mapvote if a mod gets updated
ForceMapvoteAtRoundEnd: Start a mapvote at rounds end if a mod gets updated
Merge pull request #317 from BrightPaul/patch-1

Added ForceMapvote and ForceMapvoteAtRoundEnd