[librsvg] (12 commits) ...Merge branch 'more-layout' into 'master'

[Federico Mena Quintero <federico src gnome org>]

Summary of changes:

  a55259a... render_markers_for_shape - renamed from _for_path, and pass
  8c40797... render_markers_for_shape: resolve the marker nodes here, no
  2089108... Shape now has its markers
  5ab0f9f... Move Shape to layout.rs
  a8e2092... layout::Image - new; move the image rendering parameters he
  4ccdcd9... Image: put the is_visible flag here
  b571c28... Remove obsolete comment
  cba52dd... layout::TextSpan - put a PositionedSpan's parameters here
  9b0bd88... Don't use a special case to indicate that XmlLang is not sp
  36dcbd0... layout::FontProperties - extract the font-related propertie
  d8894ce... Remove superfluous return value
  f6dc3a8... Merge branch 'more-layout' into 'master'