DB/SpellGroups: Quick fixes in latest SQL
Core/Auras: Implement stacking interaction between SPELL_AURA_MOD_TOTAL_STAT_PERCENTAGE and SPELL_GROUP_STACK_RULE_EXCLUSIVE_SAME_EFFECT. Allows BoK/BoS to stack while maintaining the strongest buff
Merge branch 'master' of https://github.com/TrinityCore/TrinityCore into ghbb
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