Ends the mission with either an "complete" or "incomplete" status.
If the .campaign file associated with the gamerule uses the postLevelComplete function, then the next mission will automatically begin if <bMissionComplete> is set to 1.
Note: this function can only be used inside singleplayer campaigns. Use setGameOver to end the game in multiplayer/skirmish or stand-alone/tutorial missions. setGameOver also works in a campaign mission with a postLevelComplete function; it ends the game and starts the next mission. -SunTzu

<bMissionComplete>: 0 = incomplete, 1 = complete.