Shoes size mappings should be in Scarpe-Components

[noahgibbs]

Right now we use the mappings of Shoes names to sizes (e.g. banner, subtitle, inscription) in several different places. For instance, I see it in scarpe-components/lib/scarpe/components/calzini.rb, scarpe-components/lib/scarpe/components/tiranti.rb, lacci/lib/shoes/drawables/para.rb, lib/scarpe/wv/span.rb and lib/scarpe/wv/para.rb.

We should have a Scarpe Component with the size mapping, and these other places should all use it and depend on it. In a few places, the data structure is slightly different. For instance, Tiranti maps the names to size and HTML tag (e.g. p, h1, h2). But we can still get the size information from one place, not keep a separate copy everywhere.