Core/Items: Items shouldn't have a negative item level

Closes #11631
DB/Quest: A Suitable Disguise

Original Work by Discover-, fixes by Nastrand, zaphod77, foldy and, dr-j.
Closes #3291
DB/Spawns: Add multiple Brewfest missing things

By Discover-, updates #3619
Core/Spells: Fixed professions resetting back to 1 when learning new level (expert/artisan)
Merge branch 'master' of github.com:TrinityCore/TrinityCore into 4.3.4