Altoids slowly loses her mind trying to implement /icon.Blend()

[Altoids1]

• [x] DreamResource refactored into Shared namespace
• [ ] DMIResource refactored into Shared
• [ ] RenderIcon -> RenderAppearance and similar renames throughout the appearance pipeline
• [ ] InterfaceIconRenderer
• [ ] /icon-manip instructions relayed from server to client
• [ ] The final, written and tested /icon.Blend() implementation
• [ ] A well-written PR description to explain why I needed to do any of the above

[Altoids1]

Casually noting that the latest commit is marked as passing by our Github Actions even though the ILVerifier throws on it