Updates

- When joining a slot, you get a mission briefing.
- When task is successful, a message is displayed, and the task is
Success.
- HeadQuarters clears all menus of the involved groups back to Planned.

Moose Development/Moose/Tasking/Mission.lua

@@ -122,6 +122,10 @@ function MISSION:SetMenu()
   end
 end
 
+
+--- Gets the COMMANDCENTER.
+-- @param #MISSION self
+-- @return Tasking.CommandCenter#COMMANDCENTER
 function MISSION:GetCommandCenter()
   return self.CommandCenter
 end