New "Travelling" Spellbook!

+ Added new Spellbook!
+ 6 New Spells!
+ Fixed a very old bug with a blank slot in combat inventory after fighting a certain something that shall go unnamed
+ Fixed a bug in the Fungal Shelf with a rock not being interactable due to interference from another object
+ Error pop-up panel now contains more specific information for bug reports
+ Other minor bugs fixes
+ Typos