- Update to version 0.19, update LLVM/Clang to version 15.
* New `--comment_style` option to control verbosity of 'why'
comments.
* New `--regex` option to select regex dialect.
* Add support for regex replacement in mappings.
* Add `begin_keep`/`end_keep` pragmas for protecting ranges of
includes or forward-declares.
* Fix several crash bugs for unusual inputs.
* More exhaustive handling of type aliases and enums.
* Recognize IWYU pragmas in CRLF source files.
* Respect configured toolchain on macOS (and overrides via
`-nostdinc++` + `-isystem`).
* In fix_includes.py, recognize namespace alias declarations.
* Improve mappings for POSIX and libc headers.
- Update iwyu_include_picker.patch.