refactor(Core/EventMap): Refactor EventMap and related scripts (#23121)

Co-authored-by: Kelno <3866946+kelno@users.noreply.github.com>
Co-authored-by: Peter Keresztes Schmidt <carbenium@outlook.com>

src/server/scripts/Outland/BlackTemple/boss_illidan.cpp

@@ -923,7 +923,7 @@ struct npc_akama_illidan : public ScriptedAI
                 me->m_Events.AddEventAtOffset([&] {
                     Talk(SAY_AKAMA_COUNCIL_2);
                     me->SetNpcFlag(UNIT_NPC_FLAG_GOSSIP);
-                }, 8000ms); // 7800ms
+                }, 8s); // 7800ms
             }
             break;
             // Reached Door

src/server/scripts/Outland/BlackTemple/boss_illidari_council.cpp

@@ -262,7 +262,7 @@ struct boss_illidari_council_memberAI : public ScriptedAI
 
     void KilledUnit(Unit*) override
     {
-        if (events.GetNextEventTime(EVENT_KILL_TALK) == 0)
+        if (!events.HasTimeUntilEvent(EVENT_KILL_TALK))
         {
             Talk(SAY_COUNCIL_SLAY);
             events.ScheduleEvent(EVENT_KILL_TALK, 6s);
@@ -582,7 +582,7 @@ struct boss_veras_darkshadow : public boss_illidari_council_memberAI
             break;
         }
 
-        if (events.GetNextEventTime(EVENT_SPELL_VANISH_OUT) == 0)
+        if (!events.HasTimeUntilEvent(EVENT_SPELL_VANISH_OUT))
             DoMeleeAttackIfReady();
     }
 };

src/server/scripts/Outland/BlackTemple/boss_shade_of_akama.cpp

@@ -251,7 +251,7 @@ struct npc_akama_shade : public ScriptedAI
                 {
                     Talk(SAY_BROKEN_FREE_2);
                 }, 3);
-                ScheduleUniqueTimedEvent(52000ms, [&]
+                ScheduleUniqueTimedEvent(52s, [&]
                 {
                     std::list<Creature*> brokens;
                     me->GetCreatureListWithEntryInGrid(brokens, NPC_ASHTONGUE_BROKEN, 40.0f);