Core/AuraScripts: Add AfterEffectRemove and AfterEffectApply hooks, to allow safe triggering of spellcasts or other actions which may call linked events while OnEffectApply and OnEffectRemove are still there for overriding the way effect is handled on target.

src/server/game/Spells/Auras/SpellAuraEffects.cpp

@@ -973,10 +973,16 @@ void AuraEffect::HandleEffect(AuraApplication const * aurApp, uint8 mode, bool a
         || mode == AURA_EFFECT_HANDLE_CHANGE_AMOUNT
         || mode == AURA_EFFECT_HANDLE_STAT);
 
+    // register/unregister effect in lists in case of real AuraEffect apply/remove
+    // registration/unregistration is done always before real effect handling (some effect handlers code is depending on this)
+    if (mode & AURA_EFFECT_HANDLE_REAL)
+        aurApp->GetTarget()->_RegisterAuraEffect(this, apply);
+
     // real aura apply/remove, handle modifier
     if (mode & AURA_EFFECT_HANDLE_CHANGE_AMOUNT_MASK)
         ApplySpellMod(aurApp->GetTarget(), apply);
 
+    // call scripts helping/replacing effect handlers
     bool prevented = false;
     if (apply)
         prevented = GetBase()->CallScriptEffectApplyHandlers(const_cast<AuraEffect const *>(this), aurApp, (AuraEffectHandleModes)mode);
@@ -988,6 +994,16 @@ void AuraEffect::HandleEffect(AuraApplication const * aurApp, uint8 mode, bool a
         return;
 
     (*this.*AuraEffectHandler [GetAuraType()])(aurApp, mode, apply);
+
+    // check if script events have removed the aura or if default effect prevention was requested
+    if (apply && aurApp->GetRemoveMode())
+        return;
+
+    // call scripts triggering additional events after apply/remove
+    if (apply)
+        GetBase()->CallScriptAfterEffectApplyHandlers(const_cast<AuraEffect const *>(this), aurApp, (AuraEffectHandleModes)mode);
+    else
+        GetBase()->CallScriptAfterEffectRemoveHandlers(const_cast<AuraEffect const *>(this), aurApp, (AuraEffectHandleModes)mode);
 }
 
 void AuraEffect::HandleEffect(Unit * target, uint8 mode, bool apply)