Scripts/ToC: Simplify the code for "A Tribute to Immortality" achievement

* also fixes the achievement being still awarded if players die indirectly during boss fights (Anub'arak adds, for example)
DB/Quest: Across Transborea

Script http://www.wowhead.com/quest=11930/across-transborea
Core/LFG: Fix party members not being able to vote to kick Leader
DB/Quest: Coward Delivery... Under 30 Minutes or it's Free

Script http://www.wowhead.com/quest=11711/coward-delivery-under-30-minutes-or-its-free
DB/Misc: Milton Beats

Closes https://github.com/TrinityCore/TrinityCore/issues/12774
DB/Misc: Ogre Tannin Basket

Prevent mass spawn of  Gordok Bushwacker by repeatedly opening masett as this was triggered by event script fro go
DB/SAI: Added SAI for some mobs in Icecrown Citadel
Core/LFG: Fix being unable to re-queue after leaving queue
DB/Misc: Rescue from Town Square

Based on original script by @untaught

Closes https://github.com/TrinityCore/TrinityCore/issues/1864
Core/LFG: Allow group bound to LFG instance to re-queue if someone leaves the party
DB/Quest: Return of the High Chief

Script http://www.wowhead.com/quest=12069 rather than the tusk just been permamently spawned on the ground
DB/Quest: All Hail Roanauk!

Script http://www.wowhead.com/quest=12140

Closes https://github.com/TrinityCore/TrinityCore/issues/3051
DB/Spells: Cleaned playercreateinfo_spell_custom table and added WoTLK class spells only

Current playercreateinfo_spell_custom table has very weird spells in it. I emptied table, created new character for each class, logon each class, learned every spell from trainer and then added rest spells from quests (for example, hunters' Tame Beast). After that I did a PHP script to get character's spells from character_spell table and insert them into playercreateinfo_spell_custom table.

This has all trainer spells and quest spells (if any) for 3.3.5!

Fixes #13509
Closes #13516
DB/Quest: Rallying the Troops
Core/Commands: implement .pvpstats command

Shows number of battleground victories in the last 7 days

Closes #13460
Merge branch '3.3.5' of https://github.com/TrinityCore/TrinityCore into 3.3.5