Scripts/Ulduar: Implement Mimiron

TODO:
Make ACU hover properly (not fly, but hover).
Fix laser barrage visual not always being infront of VX-001. Problem is
caused by bad orientation update on spellcast.
Quest: Powering our Defenses fixed

Fix by @Discover-, @untaught, @Kittnz
Core/Skinning: Fixed the creatures becoming non-skinnable even before looting them completely.

Closes #5318
Core/Loot: Make the pickpocket loot refill every 10 minutes by default on the NPCs after they have been pickpocketed.

Configurable by Creature.PickPocketRefillDelay
Closes #935
Merge pull request #12354 from Kittnz/powering_our_defenses

Quest: Powering our Defenses fixed
Update and rename 2014_06_24_05_world_quest.sql to 2014_06_25_00_world_quest.sql
Core/SmartAI: Allow the use of SMART_ACTION_SET_EVENT_PHASE with SMART_EVENT_RESPAWN.

Closes #9289
DB/Creature: Midsummer Fire Festival Spawns

Closes #1515
DB/Creature: Challe's Home For Little Tykes

Closes #5921
DB/Quest: A Tangled Skein

By Trista, closes #6584
Create 2014_06_25_04_world_misc.sql

By dr-j, closes #4399
DB/Quest: Redemption

By dr-j, closes #11233
DB/Conditions: Healing the Lake/Neutralizing Agent

By MitchesD, closes #3337
SQL: Sync auth_database
DB/Conditions: Fix conditions for spell "Symbol of Life"
SQL: Renamed updates to follow naming convention
Core/Skills: Check if a skill can be unlearned with SkillRaceClassInfo.dbc data and use max skill level from SkillTiers.dbc
Tools/MMapsGenerator: Improve mmaps generation time on multi-core CPUs

Queue biggest maps first for mmaps generation to avoid waiting for last map, usually map id 571.
Fix wrong maps count being printed on startup.
Core/MMAPs: Update recast

Update recast to https://github.com/memononen/recastnavigation/commit/42b96b7306d39bb7680ddb0f89d480a8296c83ff
Previous MMAPs might still work but it's recommended to re-extract them.
DB/Quest: Redemption

Fix missing delete.