[librsvg] (22 commits) ...Merge branch 'font-shorthand' into 'master'

[Federico Mena Quintero <federico src gnome org>]

Summary of changes:

  c4fd517... Parser for the line-height property
  e341f0d... Add line-height to SpecifiedValues and ComputedValues
  f9af71e... Add tests for the computed value of line-height
  3d09cea... Comment on how we parse line-height, but don't use it, for 
  24c1691... Make FontSize not a newtype
  acd23a1... Make FontWeight not a newtype
  00dcc1d... Make LetterSpacing not a newtype
  a8d18c4... Remove the unused pattern in make_property!
  8640591... Document make_property! a bit better
  5a7fdb3... Make FontFamily not a newtype
  5d04d52... Provide an accessor to FontFamily's inner string
  075bc2d... Make LineHeight not a newtype
  b631e37... Implement parser for the "font" shorthand
  da0558c... Add a couple of tests for the font shorthand parser
  11324e3... Extract function to expand the marker shorthand
  91253bd... Replace if with match
  47a12a2... Clean up the import aliases in properties.rs
  24cfc88... Extract separate FontSpec struct from the Font::Spec varian
  38bc401... Declare the 'font' shorthand for SpecifiedValues and expand
  7c6079b... Add a reference test for the 'font' shorthand
  037848c... cargo fmt
  d9dbf08... Merge branch 'font-shorthand' into 'master'