Core/Spells: Implement SPELL_ATTR4_FIXED_DAMAGE

Spells with this attribute will ignore damage taken auras except for mechanic damage taken (trauma, etc) and will ignore resilience because the damage caused by those spells is based off another spell' damage
Core/Util: A couple useful new functions for EventMap, as well as getting rid of some old junk
Merge pull request #12135 from Trisjdc/event_map_extension

Core/Util: A couple useful new functions for EventMap
Merge pull request #12201 from Unholychick/patch-2

Core/Spells: Implement SPELL_ATTR4_FIXED_DAMAGE
DB/Creature: Remove phaseMask hack of Shadowmoon Tuber Nodes

Related to 26370223a0b9ab7b9542a6a727347063397f0fa7
Core/Tickets: Sprinkled some transaction magic on HandleGMSurveySubmit