[librsvg] (23 commits) ...Merge branch 'accept-language' into 'master'

[Federico Mena Quintero <federico src gnome org>]

Summary of changes:

  f50436f... Evaluate conditional processing attributes at rendering tim
  801945a... Convert the locale to a list of language tags before matchi
  93a4909... Convert the locale to LanguageTags only once
  0e7b35f... Convert the systemLanguage attribute to LanguageTags, then 
  56f3218... Store LanguageTags inside SystemLanguage and really evaluat
  8882342... Start sketching out an Accept-Language parser
  9b8db13... Finish parser for AcceptLanguage
  b9158d5... AcceptLanguage - add an iter() method
  b5d484d... Rename AcceptLanguageError
  22bfd70... Add iter() method to LanguageTags
  0ad432c... Add LanguagetTags::from() to construct it from a vector
  722968a... Move LanguageTags to the accept_language module
  7459bc1... Use a new Language / UserLanguage enum instead of LanguageT
  71d2c1c... New API CairoRenderer::with_language
  bb1bdb6... When a test reference file doesn't exist, panic with a bett
  41edfce... impl Error for AcceptLanguageError
  d1658a7... (#356): Add --accept-language option to rsvg-convert
  a41f89d... Add --accept-language to rsvg-convert's man page
  7a5f6e1... Add additional reference URLs to the man page
  62c7db5... Remove "xml" and "recording" from the --format option in th
  e830247... Clippy - is_empty() instead of len() == 0
  2567c6d... Clippy - coalesce ifs with same bodies
  5f2530a... Merge branch 'accept-language' into 'master'