Module prelude

Traits and essential types intended for blanket imports.

Traits

• FontExt
  Trait containing all Font methods.
• FontFaceExt
  Trait containing all FontFace methods.
• FontFamilyExt
  Trait containing all FontFamily methods.
• FontMapExt
  Trait containing all FontMap methods.
• FontsetExt
  Trait containing all Fontset methods.
• IsAttribute
• RendererExt
  Trait containing all Renderer methods.