package:ffigen v22.1.0

• The YAML configuration format is deprecated and will be removed in a future
  release.
• Added Input.appendCompilerOptions to allow appending custom compiler
  options to default options instead of replacing them. Removed
  defaultCompilerOpts from the public API, since it is now redundant and was
  always a hack.
• Remove internal details from the public API of ImportedType.
• Default to C++17 compiler options when C++ bindings are enabled.
• Preserve documentation comments on same-name typedefs when generating the
  underlying type binding.
• Fix a bug where functions
  using pointers to a C++ class were skipped unless C++ support was configured:
  class declarations are now treated like structs, and with C++ support on,
  the C++ class wrapper vs. plain struct decision is made by POD-ness rather
  than by the class/struct keyword.
• Fix a bug where a C++ type named through a using-declaration (e.g.
  std::uint16_t) was left unresolved, which dropped every function that
  mentioned it from the bindings. Such types now resolve through their
  canonical type.
• Generate bindings for declarations inside C++ extern "C" { ... }
  blocks, which were previously skipped entirely.
• Generate bindings for C++ enums declared inside a namespace or a record.
  Their Dart name is the scope path flattened with $, e.g.
  outer::inner::Color becomes outer$inner$Color, and originalName is
  the qualified C++ name, so a Visitor or importType can filter or rename
  by it.
• Generate bindings for C++ structs, classes and unions declared inside a
  namespace or a record, named the same way. Scoped records are not yet
  surfaced when C++ class support is enabled.
• Allow package:cli_util versions 0.5.x and 0.6.x.
• Fix a crash during code generation when a typedef refers to a function
  pointer with an unsupported parameter type (e.g. a C++ reference). Such
  typedefs are now skipped like other unsupported typedefs, so struct members
  and functions using them are dropped instead of crashing the writer.