Log Message:
stone-soup[-sdl]: update to 0.28.0

Highlights
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* New Cinder Acolyte background, followers of the dying god Ignis.
* The Hells burn with new fury, filled with new monsters and effects.
* Yredelemnul completely redesigned; Okawaru and Jiyva significantly changed.
* The Spider's Nest respun - many new monsters and maps lurk within.
* Magical orbs added as a new category of off-hand equipment.