Fix percent-based damage auras, map multipliers honor level scaling

- percent-based damage auras will now ignore level scaling (per-player scaling only)
- map multipliers (damage/healing and health) will now honor the level scaling setting
- use a custom struct to store and move around world multipliers
- properly remove LevelScalingEndGameBoost until it can be fixed (azerothcore#156)
- creatures summoned by a boss will now be scaled like bosses
- further refinement of trigger handling logic
- fix active creature not being decremented on creature removal
- fix incorrect announcing of GMs entering/exiting the instance
- improvements for in-game commands
- continued log improvements

conf/AutoBalance.conf.dist

@@ -809,12 +809,19 @@ AutoBalance.LevelScaling.DynamicLevel.DistanceCheck.PerInstance="189 500"
 
 #
 #     AutoBalance.LevelScaling.LevelEndGameBoost
+#
+#        NOTICE: This setting is currently not implemented pending a rewrite.
+#                Enabling it here has NO effect.
+#
+#        See: https://github.com/azerothcore/mod-autobalance/issues/156
+#
+#        Old description:
 #        End game creatures have an exponential (not linear) regression
 #        that is not correctly handled by db values. Keep this enabled
 #        to have stats as near possible to the official ones.
 #
-#        Default:     1 (1 = ON, 0 = OFF)
-AutoBalance.LevelScaling.EndGameBoost = 0
+#        Default:     0 (1 = ON, 0 = OFF)
+AutoBalance.LevelScaling.EndGameBoost = 0        # setting to 1 does not do anything
 
 ##########################
 #