Core/Misc:  Fix some static analysis issues

Fix some static analysis issues, mostly false positive about fields not initialized in the constructor. It's good practice anyway to always initialize them.
Scripting/Sholazar Basin: Move spells for quest Dreadsaber Mastery: Stalking the Prey (12550) to cpp.
Scripting/Sholazar Basin: Fix spell_shango_tracks script.
DB/Misc - Some missing gossip options and conditions.
Merge remote-tracking branch 'TrinityCore/master'
[TW089] - Add scripts for some AT quests and achieves.

Thanks to whoever i have the main work from..can't really remember...