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* Core/Spells: implement SpellInfo helper to filter for relevant mechanic immunities when sending SMSG_SPELL_START packets. According to sniff analysis Blizzard does not send all mechanic immunities of creatures but instead only the ones that are responsible for actual interrupts which are MECHANIC_INTERRUPT and MECHANIC_SILENCE. Additionally we no longer send immunities for instant cast spells as sniffs confirm that they are not sent for spells without a cast time.