Scripts/Commands: Allow to set a custom duration to the Freeze command applied Aura

- Allow to set a default duration for the Freeze Aura in worldserver.conf
- Handle the .freeze and .unfreeze command custom effects through the Freeze AuraScript
- Make players able to eventually unfreeze by themselves since the aura will expire without someone having to use .unfreeze
- Make .freeze command usable with the following syntax:

      * .freeze (with a targeted player)
      * .freeze duration_in_seconds (with a targeted player)
      * .freeze playername duration (if duration is an invalid value it will be defaulted to the config one)
      * .freeze playername (in this case, duration will be defaulted to the config value)

- Make .listfreeze command able to show the remaining freeze duration on all affected players

Closes #12972

src/server/scripts/Spells/spell_generic.cpp

@@ -3609,6 +3609,79 @@ class spell_gen_eject_all_passengers : public SpellScriptLoader
         }
 };
 
+enum GMFreeze
+{
+    SPELL_GM_FREEZE = 9454
+};
+
+class spell_gen_gm_freeze : public SpellScriptLoader
+{
+    public:
+        spell_gen_gm_freeze() : SpellScriptLoader("spell_gen_gm_freeze") { }
+
+        class spell_gen_gm_freeze_AuraScript : public AuraScript
+        {
+            PrepareAuraScript(spell_gen_gm_freeze_AuraScript);
+
+            bool Validate(SpellInfo const* /*spellInfo*/) override
+            {
+                if (!sSpellMgr->GetSpellInfo(SPELL_GM_FREEZE))
+                    return false;
+                return true;
+            }
+
+            void OnApply(AuraEffect const* /*aurEff*/, AuraEffectHandleModes /*mode*/)
+            {
+                // Do what was done before to the target in HandleFreezeCommand
+                if (Player* player = GetTarget()->ToPlayer())
+                {
+                    // stop combat + make player unattackable + duel stop + stop some spells
+                    player->setFaction(35);
+                    player->CombatStop();
+                    if (player->IsNonMeleeSpellCast(true))
+                        player->InterruptNonMeleeSpells(true);
+                    player->SetFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_NON_ATTACKABLE);
+
+                    // if player class = hunter || warlock remove pet if alive
+                    if ((player->getClass() == CLASS_HUNTER) || (player->getClass() == CLASS_WARLOCK))
+                    {
+                        if (Pet* pet = player->GetPet())
+                        {
+                            pet->SavePetToDB(PET_SAVE_AS_CURRENT);
+                            // not let dismiss dead pet
+                            if (pet->IsAlive())
+                                player->RemovePet(pet, PET_SAVE_NOT_IN_SLOT);
+                        }
+                    }
+                }
+            }
+
+            void OnRemove(AuraEffect const* /*aurEff*/, AuraEffectHandleModes /*mode*/)
+            {
+                // Do what was done before to the target in HandleUnfreezeCommand
+                if (Player* player = GetTarget()->ToPlayer())
+                {
+                    // Reset player faction + allow combat + allow duels
+                    player->setFactionForRace(player->getRace());
+                    player->RemoveFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_NON_ATTACKABLE);
+                    // save player
+                    player->SaveToDB();
+                }
+            }
+
+            void Register() override
+            {
+                OnEffectApply += AuraEffectApplyFn(spell_gen_gm_freeze_AuraScript::OnApply, EFFECT_0, SPELL_AURA_MOD_STUN, AURA_EFFECT_HANDLE_REAL);
+                OnEffectRemove += AuraEffectRemoveFn(spell_gen_gm_freeze_AuraScript::OnRemove, EFFECT_0, SPELL_AURA_MOD_STUN, AURA_EFFECT_HANDLE_REAL);
+            }
+        };
+
+        AuraScript* GetAuraScript() const override
+        {
+            return new spell_gen_gm_freeze_AuraScript();
+        }
+};
+
 void AddSC_generic_spell_scripts()
 {
     new spell_gen_absorb0_hitlimit1();
@@ -3689,4 +3762,5 @@ void AddSC_generic_spell_scripts()
     new spell_gen_wg_water();
     new spell_gen_whisper_gulch_yogg_saron_whisper();
     new spell_gen_eject_all_passengers();
+    new spell_gen_gm_freeze();
 }