also:
- fixed parser not correctly round-tripping int format in some cases
- added `TOML_ENABLE_FORMATTERS` option
- added `operator->` to `toml::value`
- refactoring
also:
- removed `TOML_LARGE_FILES`
- removed unnecessary template machinery (esp. where ostreams were involved)
- made all overloaded operators 'hidden friends'
- documentation fixes
- version bump - this will form the foundation of v3
- moved implementation-only headers to `/impl`
- replaced `[[nodiscard]]` with `TOML_NODISCARD`
- added `.clang-format` + applied to all files
also:
- added support for Unicode 14.0
- fixed minor documentation issues
- version bump (pre-emptive for next release)