*Update Mana Shield Spell Power Coefficient - by fukifat.

*Add function void AuraEffect::HandleAuraEffectSpecificMods(bool apply, bool Real, bool changeAmount), and aura effect specific stuff to it.
*More correct aura scaling with lvl for area auras.
*Prevent exploits with relog while having auras with modified amount.

--HG--
branch : trunk

sql/updates/4938_world.sql

@@ -0,0 +1,3 @@
+DELETE FROM `spell_bonus_data` WHERE `entry` IN(53352);
+INSERT INTO `spell_bonus_data` (`entry`, `direct_bonus`, `dot_bonus`, `ap_bonus`, `ap_dot_bonus`, `comments`) VALUES
+(53352, -1, -1, 0.14, -1, 'Hunter - Explosive Shot (triggered)');