[mr2639] Remove Hacks and implement Mark of the Fallen Champion from Saurfang Encounter

NOTE for Devs: Trigger Spell from 72408 -> 72409 can not hit Units without 72410, because of Target Aura Spell (72410)
[mr2640] Fix Resistence Calculation
GetResistanceBuffMods(positiv) - GetResistanceBuffMods(negativ) = 2xGetResistanceBuffMods(positiv)
because positiv - negativ = bigger positiv
Negativ GetResistanceBuffMods are stored in int32 and smaler then 0
[mr2641] remove double code Item - Druid T8 Restoration 4P Bonus