AHBot related fixes

Fix rebuild command requiring a dummy value

Fix ahbot config to normal

Fix sellprice setting in core. Closes #13425
DB/Misc: Short John Mithril / Arena Treasure Chest

* Remove permament spawn of Arena Treasure Chest 
* Script Short John Mithril to start wp at start of event, say his 2 lines (1st zone wide) and summon Arena Treasure Chest
Merge pull request #13440 from Rochet2/ahbot

Core/AH: AHBot related fixes
Scripts/Ulduar: Fix Ignis' Slag Pot periodic ticks and enable achievement "Hot Pocket"
DB/Disables: Remove criteria for the "Shattered" achievement from disables

...as it works fine. Ulduar/Ignis achievement.
SQL: Update /dev/world_database.sql
DB/Achievement: Remove unneeded criteria data for "A Tribute to Immortality"

Required team is already checked from dbc on criteria update
Closes #4622
Thanks to @joschiwald

(cherry picked from commit 1823e2f9b822b163a7f79719e6c8d1504707292e)
DB/Quest: New Recruit

Fix New Recruit http://www.wowhead.com/quest=13143
Scripts/ToC: Twin Val'kyr

- Script rewritten to EventMaps
- Implemented random special ability sequence
- Adjusted timer for special abilities to 45 seconds
- Misc clean up.
Closes #7546
DB/Quest: The Vile Hold

Script Eye of Dominion / Lithestalker for http://www.wowhead.com/quest=13145
Scripts/ToC: Misc forgotten clean ups
DB/Quest: A Undead's Best Friend / Eidolan Watcher

Fix http://www.wowhead.com/quest=13169/an-undeads-best-friend and other quests using this vehicle 

Only major bug as with the lithe stalker is when player exits vehicle player should get teleported back to position where they mounted vehicle as if it was pocessed but this is vehicle
Scripts/ToC: Few codestyle changes and clean ups
Merge branch '3.3.5' of https://github.com/TrinityCore/TrinityCore into trinity-wotlk-ai
[ai-0.36-101] use pet in attackers value