[librsvg] (30 commits) ...Merge branch 'parse' into 'master'

[Federico Mena Quintero <federico src gnome org>]

Summary of changes:

  6fd3c7b... color_matrix: parse saturate as f64
  cd477fd... gradient: use helper struct to parse offset
  6fe72dd... parsers: helper structs for NonZero and NonNegative numbers
  1218b82... turbolence: use NonNegative for parsing
  c400329... morphology: use NonNegative for parsing
  9d6e0d9... blur: use NonNegative for parsing
  d52e8fc... lighting: use helper structs for parsing
  9f20b48... convolve_matrix: use NonNegative and NonZero for parsing
  49ff91b... convolve_matrix: move the sanity checks on targetX/Y at ren
  d6d5c20... convolve_matrix: simplify parsing of order
  5986313... filter: rework how we check units
  8d5bdef... parsers: remove parse_and_validate method
  fb0560f... convolve_matrix: do not raise parse error on divisor set to
  914b2e5... reftests: add reftest for feConvolveMatrix divisor attribut
  390756b... parsers: move NumberList together with the rest of the help
  7a5c373... marker: small cleanup
  6ddc46a... lighting: remove constraints for specularExponent
  7041743... error: fix a clippy suggestion
  f5148ed... lighting: simplify code
  5340acf... Add an enum_default macro and use it
  9d71fdc... style: simplify parsing
  34c48ea... aspect_ratio: derive default
  569b4fa... Move attributes.rs in the xml submodule
  df4a1f4... attributes: add a simple constructor for tests
  cb2f8e3... lighting: factor out a Light struct
  b1a3278... pattern: calculate transforms inside UserSpacePattern
  f99a0c7... bbox: cleanup
  e75f40b... filters: do not use BoundingBox to calculate filter bounds
  e3c1843... filters: do not store a FilterCtx ref in the bounds builder
  e175ec2... Merge branch 'parse' into 'master'