Core/Spells: Implemented SPELL_ATTR4_IGNORE_RESISTANCES.

Closes #919

Signed-off-by: Subv <[email protected]>

src/server/game/Entities/Unit/Unit.cpp

@@ -1540,7 +1540,8 @@ void Unit::CalcAbsorbResist(Unit* victim, SpellSchoolMask schoolMask, DamageEffe
     DamageInfo dmgInfo = DamageInfo(this, victim, damage, spellInfo, schoolMask, damagetype);
 
     // Magic damage, check for resists
-    if ((schoolMask & SPELL_SCHOOL_MASK_NORMAL) == 0)
+    // Ignore spells that cant be resisted
+    if ((schoolMask & SPELL_SCHOOL_MASK_NORMAL) == 0 && (spellInfo->AttributesEx4 & SPELL_ATTR4_IGNORE_RESISTANCES) == 0)
     {
         float victimResistance = float(victim->GetResistance(schoolMask));
         victimResistance += float(GetTotalAuraModifierByMiscMask(SPELL_AURA_MOD_TARGET_RESISTANCE, schoolMask));

src/server/game/Miscellaneous/SharedDefines.h

@@ -410,7 +410,7 @@ enum SpellAttr3
 
 enum SpellAttr4
 {
-    SPELL_ATTR4_UNK0                             = 0x00000001, //  0
+    SPELL_ATTR4_IGNORE_RESISTANCES               = 0x00000001, //  0 spells with this attribute will completely ignore the target resistances (theese spells cant be resisted)
     SPELL_ATTR4_PROC_ONLY_ON_CASTER              = 0x00000002, //  1 proc only on effects with TARGET_UNIT_CASTER?
     SPELL_ATTR4_UNK2                             = 0x00000004, //  2
     SPELL_ATTR4_UNK3                             = 0x00000008, //  3