Fix RTV votes that extend not having a cooldown

and changed the notification for a tied random choice so it doesn't
repeat the map name.
Make sure plugins are cleaned up if an error occurs

when they initialise.
Better way to deal with next vote time

Though self.Enabled should be nil at least once, this looks nicer
anyway...
Old code, not needed
Fix some inconsistent behaviour with plugins

Plugins were being unloaded when they had never been loaded.
Change tournament mode's conflict list

Remove mapvote and afkkick as those don't necessarily conflict and
should be left up to the server admin to choose.
Merge pull request #401 from Person8880/develop

Fix a few minor bugs