Xinhuan (4):
      1c16bdd: Put a throtle on the UpdateBars function, reducing CPU usage to about 20%-40% compared to before, with no loss of threat updates (more savings when in a larger raid).
      1be205d: Clear the guidNameLookup table on zoning to recover some memory.
      dcf493f: Fix Omen getting stuck to the mouse if autocollapse is on and you moved Omen while you are in combat and exited combat during the move.
      18c0419: Set a player's threat to 0 (for display purposes) if the player's threat is less than 0. This occurs on Fade and Mirror Image, which gives the caster a temporary threat reduction of 410057408 (or 4.1m threat in Omen's terms). Previously Omen ignored players with negative threat.

