v0.7.0

Removed

• The :decoder_sources option. Generated helpers are typed against the
  reference Decoder, whose method signatures a crate's own keeps.
• The :sparse_messages option. Sparse message decoders always use one table
  of their fields, shared with skip decoders when both are generated, which is
  what :descriptor did; :match generated the same Rust another way.
• Unknown options raise instead of being ignored.

Changed

• The generator's helper Rust comes from ordinary RustQ modules, included whole
  per feature, instead of modules built at generation time and lists of the
  functions to take from them. Full and sparse decoders share their primitive
  readers, enum decoding, and field reading, and KiwiDecodeFn replaces
  KiwiSparseDecodeFn and KiwiFullDecodeFn. The skip helpers are one module,
  KiwiCodec.RustlerGenerator.Skip.Helpers, which RustQ code calling them names
  instead of Skip.ValueHelpers. This needs RustQ 1.0.0-rc.19.

• The record feature writes each definition once, as a row of one
  kiwi_records! call: its fields and enum values one per line. The macro,
  in the record runtime, expands to the definition table and the
  kiwi_record_definitions and kiwi_records constants as before, which
  the generator used to write out separately, one table field per line.
  Figma's schema generates about 630 KB less Rust.