Core/Auras: Expanding functionality of SPELL_GROUP_STACK_RULE_EXCLUSIVE_SAME_EFFECT to be able to take care of aura effects inside their handlers

Currently handled:
- SPELL_AURA_MOD_RESISTANCE_PCT
- SPELL_AURA_MOD_STAT
- SPELL_AURA_MELEE_SLOW
- SPELL_AURA_MOD_MELEE_HASTE
- SPELL_AURA_MOD_DAMAGE_PERCENT_DONE

Necessary to allow stack rules such as BoK/BoS/Bok-Drums and others to be all in a target with all of the aura effects, yet with only the 'highest' effect active
DB/Quest: Fix some missing quest texts

By crysicle, closes #12167
Core/Vehicles: Fixed channeled spells being interrupted for passengers when vehicle moves
Core/NetworkIO: Adjust more packet throttling values

Ignore some opcodes that don't cause any trouble.
Remove old Allow/Disable Anti-DoS system since it's no longer required.
Merge pull request #12233 from Trisjdc/aura_stacking

Core/Auras: Expanding functionality of SPELL_GROUP_STACK_RULE_EXCLUSIVE_SAME_EFFECT to be able to take care of aura effects inside their handlers
Merge remote-tracking branch 'upstream/master'
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