diagrams-cairo-0.7: Cairo backend for diagrams drawing EDSL

A full-featured backend for rendering diagrams using the cairo rendering engine.

• Diagrams.Backend.Cairo.CmdLine - if you're just getting started with diagrams, begin here.
• Diagrams.Backend.Cairo - look at this next. The general API for the cairo backend.
• Diagrams.Backend.Cairo.Internal - the implementation guts of the cairo backend. Users should normally not need to import this module.
• Diagrams.Backend.Cairo.Text - cairo-specific text support, including automatic bounding boxes.
• Diagrams.Backend.Cairo.List - render diagrams to two-dimensional lists of colors (i.e. pixels).
• Diagrams.Backend.Cairo.Ptr - render diagrams to buffers in memory.