Core/Spells: rework part 4: iterate over effects first

Implement far spell queue processing

# Conflicts:
#	src/server/game/Spells/Spell.cpp

src/server/scripts/Northrend/Ulduar/Ulduar/boss_xt002.cpp

@@ -629,29 +629,6 @@ class npc_pummeller : public CreatureScript
  *        XE-321 BOOMBOT
  *
  *///----------------------------------------------------
-class BoomEvent : public BasicEvent
-{
-    public:
-        BoomEvent(Creature* me) : _me(me)
-        {
-        }
-
-        bool Execute(uint64 /*time*/, uint32 /*diff*/) override
-        {
-            // This hack is here because we suspect our implementation of spell effect execution on targets
-            // is done in the wrong order. We suspect that EFFECT_0 needs to be applied on all targets,
-            // then EFFECT_1, etc - instead of applying each effect on target1, then target2, etc.
-            // The above situation causes the visual for this spell to be bugged, so we remove the instakill
-            // effect and implement a script hack for that.
-
-            _me->CastSpell(_me, SPELL_BOOM, false);
-            return true;
-        }
-
-    private:
-        Creature* _me;
-};
-
 class npc_boombot : public CreatureScript
 {
     public:
@@ -703,12 +680,7 @@ class npc_boombot : public CreatureScript
 
                     damage = 0;
 
-                    // Visual only seems to work if the instant kill event is delayed or the spell itself is delayed
-                    // Casting done from player and caster source has the same targetinfo flags,
-                    // so that can't be the issue
-                    // See BoomEvent class
-                    // Schedule 1s delayed
-                    me->m_Events.AddEvent(new BoomEvent(me), me->m_Events.CalculateTime(1*IN_MILLISECONDS));
+                    DoCastAOE(SPELL_BOOM);
                 }
             }