Scripted/Pets: Move some player pets in pet_xxx.cpp
DB/GO: Increase radius of Mystery of the Infinity gameobject spellfocus

Closes #920

(Quest is still broken; being worked on)
DB/SAI: Fix quest "Where in the World is Hemet Nesingwary?"

Script NPC Archmage Pentarus

Closes #921
DB/SAI: Script NPC Arch Mage Xintor

Closes #1743
DB/Spells: Rename LoS for spell Rod of Purification

Ref #1972
Scripted: Fix non pch build
Core: Fix build

(cherry picked from commit 81daef8b2205fca4310720d3186bafca8d75a792)