Did as much patching as I could before I need to get off.  

Optimisation

• Refactor of book UI to support generic books which don't need individual cover sprites (due to a bug)

Fixes

• Fixed First Aid Book's title cover
• Removed test quest option from Cass's dialogue tree
• Fixed Wagtail enemy's charge
• Fixed DivideByZero error on Fresh Coffee item
• Fixed missing images on sell buttons from player inventory

Other Content

• Added a couple of lines to the Amari Post gang