[librsvg] (32 commits) ...Merge branch '597-sanitize-errors' into 'master'

[Federico Mena Quintero <federico src gnome org>]

Summary of changes:

  42ee8d1... Remove unused RenderingError::CircularReference
  8658077... Remove unused RenderingError::InvalidHref
  3130f58... Add LoadingError::LimitExceeded
  7c8a404... Use LoadingError::LimitExceeded when too many XML elements 
  975ce85... Add LoadingError::OutOfMemory
  f24e85a... Map image loading errors from Cairo to LoadingError
  6c58ef3... Remove unused LoadingError::Cairo
  63cfcbf... Extract function
  a6bb6e5... Rename LoadingError::Unknown to LoadingError::Other
  f64096f... Remove LoadingError::NoDataPassedToParser
  ba01c69... Remove LoadingError::CouldNotCreateXmlParser
  73d8572... Rename RenderingError::InstancingLimit to LimitExceeded
  fc5d998... LoadingError: condense SvgHasNoElements and RootElementIsNo
  570e23f... Make LoadingError and RenderingError non_exhaustive
  7e50c99... impl Display for DefsLookupErrorKind
  c2fe4c4... RenderingError: separate out InvalidId and IdNotFound
  b55a5b1... Move the HandleIsNotLoaded error to c_api
  a18d9d5... Add a string description to RenderingError::OutOfMemory
  9188f3f... Remove LoadingError::EmptyData
  94944ca... Remove LoadingError::BadStylesheet
  12598f5... Move get_input_stream_for_loading to the xml module
  59de2c6... Use an internal IoError for the io module, instead of Loadi
  180152e... impl Error only for public error types
  172f339... Use ok_or_else like clippy says
  5e4e295... Replace RenderingError::Cairo(status) with RenderingError::
  d76aba8... Replace LoadingError::Glib(gerror) with LoadingError::Io(St
  e80df07... FilterError does not need to be PartialEq
  2a1954d... RenderingError should not be PartialEq
  c235f21... ValueErrorKind should not be PartialEq
  d9d046f... HrefError and DefsLookupErrorKind don't need to be PartialE
  43d4270... Use an ImplementationLimit enum to detail the LimitExceeded
  f3dd6d1... Merge branch '597-sanitize-errors' into 'master'