Another round of QOL improvements and bugfixes.
Changelog:
Added new artwork for Isabell Nona
Made the fight with Butch completely optional
Staff upgrade trainers have been fixed and relocated for easier access
Fixed some of Kaywin's dialogue bugs
Fixed room upgrade typos
Lowered volume for some sound effects
Fixed some friendly combat AI issues
Fixed Kaywin's trust issues
Abyss questline now has development tag
Added note to journal regarding thumbnails