Core/Spells: Fixed Shadowstep taking the caster out of combat while it shouldn't
Core/Spells: Fix Cheat Death formula
Core/Auras: Update model overwriting rules for SPELL_AURA_TRANSFORM
Core/Maps: Allow logging players to enter in instances that have an encounter in progress
Core/Spells: Corpse Explosion should not be able to pick the Ghoul out of implicit targets
Core/Players: Improve quest item adding/removal checks, solves cases where quest item removal (under specific conditions) incorrectly incompletes quests
Scripts/Items: Imp in a Ball
Merge pull request #12217 from Trisjdc/spell_corpse_explosion

Core/Spells: Corpse Explosion should not be able to pick the Ghoul out of implicit targets
DB/Creature: Fix Eva Sarkhoff

By dr-j, closes #12224
Core/Spells: add missing spellradius to spell "Achievement Check" (fixes hor achievments)
Merge pull request #12057 from Trisjdc/imp_in_a_ball

Scripts/Items: Imp in a Ball
Merge pull request #12204 from Trisjdc/map_enter

Core/Maps: Allow logging players to enter in instances that have an encounter in progress
Merge pull request #12216 from Trisjdc/quest_item_check

Core/Players: Improve quest item adding/removal checks, solves cases where quest item removal (under specific conditions) incorrectly incompletes quests
Merge pull request #12128 from Trisjdc/aura_transform

Core/Auras: Update model overwriting rules for SPELL_AURA_TRANSFORM
Core/GOs: When unlinking Fishing Bobber from player to prevent despawning, unlink from spell as well to prevent removing unwanted auras
Scripts/Blackrock Depths: Converted to eventmap+minor coding style changes

Closes #11730
Core/Spells: Anti-Magic shell should give immunity to all spells that belong to SPELL_SCHOOL_MASK_MAGIC regardless of dispel type
Core/Spells: Implement Periodic mechanics

Change behaviour of single target periodic aura ticks to be more blizzlike
Also add some missing handling of SPELL_AURA_MOD_CREATURE_AOE_DAMAGE_AVOIDANCE
Fixes Deep wounds and Chimera Shot Serpent
Remove an ancient hack with Drain Soul, spell id 100001 can now be deleted from spell_dbc table
Allows Rolling dot mechanics and allows DK's to roll diseases with pestilence,
see link for info:

http://forums.elitistjerks.com/topic/82503-frost-dps-in-333this-will-be-a-day-long-remembered/page-88
Merge pull request #12232 from Trisjdc/anti_magic_shell

Core/Spells: Anti-Magic shell should give immunity to all spells that belong to SPELL_SCHOOL_MASK_MAGIC regardless of dispel type
Merge pull request #12231 from Trisjdc/fishing_boober_link

Core/GOs: When unlinking Fishing Bobber from player to prevent despawning, unlink from spell as well to prevent removing unwanted auras