The cf pack's shapes are monochrome and paint currentColor, so tinting is just setting
color on the wrapper — no per-set sprite, and one shape serves every set that uses it.
iconKey
iconKey:string
A glyph in the cf icon pack, namespaced — hand it straight to DynamicIcon's iconKey.
One icon of a conditional-format icon set: which shape to draw and what to tint it.