Ensure that all actions are compared to fixed point in time (ie. world update start)

Port From (https://github.com/TrinityCore/TrinityCore/commit/60663d1374beef3103f4787152654034fa4a8897)

Source/Game/Entities/Unit/Unit.Combat.cs

@@ -1104,7 +1104,7 @@ namespace Game.Entities
                 {
                     // Part of Evade mechanics. DoT's and Thorns / Retribution Aura do not contribute to this
                     if (damagetype != DamageEffectType.DOT && damage > 0 && !victim.GetOwnerGUID().IsPlayer() && (spellProto == null || !spellProto.HasAura(GetMap().GetDifficultyID(), AuraType.DamageShield)))
-                        victim.ToCreature().SetLastDamagedTime(Global.WorldMgr.GetGameTime() + SharedConst.MaxAggroResetTime);
+                        victim.ToCreature().SetLastDamagedTime(GameTime.GetGameTime() + SharedConst.MaxAggroResetTime);
 
                     victim.AddThreat(this, damage, damageSchoolMask, spellProto);
                 }

Source/Game/Entities/Unit/Unit.Spells.cs

@@ -1809,7 +1809,7 @@ namespace Game.Entities
 
         void GetProcAurasTriggeredOnEvent(List<Tuple<uint, AuraApplication>> aurasTriggeringProc, List<AuraApplication> procAuras, ProcEventInfo eventInfo)
         {
-            DateTime now = DateTime.Now;
+            DateTime now = GameTime.GetGameTimeSteadyPoint();
 
             // use provided list of auras which can proc
             if (procAuras != null)
@@ -2788,7 +2788,7 @@ namespace Game.Entities
 
                 // Remember time after last aura from group removed
                 if (diminish.Stack == 0)
-                    diminish.HitTime = Time.GetMSTime();
+                    diminish.HitTime = GameTime.GetGameTimeMS();
             }
         }