Custom paintings

Changes some glass panels in Limbo and some paintings in Fraud to custom images. Configurable.

I haven't figured out how to replace the other paintings yet, would love some input on this

Copyright & attribution

• Code is under MIT license
• Bundled artworks are by Ravimo licensed under CC-BY 4.0, cropped to fit ingame frames nicely
• Thank you bitmotte for showing how to replace the small Fraud paintings in their CoughingBaby mod