[librsvg] (18 commits) ...Merge branch 'refactor-errors'

[Federico Mena Quintero <federico src gnome org>]

Summary of changes:

  e5a1b3c... Remove ParseFromStreamError; use LoadingError directly ever
  ed1f453... Change the error code for short files
  be1f3ed... Move all the GError machinery to c_api.rs
  9b84dd7... Log all errors in c_api to get diagnostics from apps which 
  92c49be... parse_one_presentation_attribute() - renamed from parse_att
  9c404a7... Don't log non-presentation attributes as unknown properties
  bf06b86... Log parse errors on properties with less noise from QualNam
  059be99... Log errors for presentation attributes as such, not as styl
  7c1004b... Make fmt::Display for NodeError less verbose
  d5826ff... Don't convert to NodeError in parse_one_presentation_attrib
  0716181... impl Parse for IRI - return ValueErrorKind, not ParseError
  9d46585... trait Parse - remove the Err associated type
  2959f77... NodeError::new() - renamed from ::attribute_error()
  e97580e... Convert directly from cssparser::BasicParseError to our Val
  f147829... Images: make methods private
  a34a632... Images::lookup() - take an AllowedUrl, not a &str
  2c4ebf3... Get rid of ParseError; only use ValueErrorKind
  a974bc4... Merge branch 'refactor-errors'