also:
- added `date_time` converting constructors from `date` and `time`
- added `is_key<>` and is_key_or_convertible<>` metafunctions
- exposed `TOML_NAMESPACE_START` and `TOML_NAMESPACE_END` macros to help with ADL specialization scenarios
- added encoder and decoder for `toml-test` (closes#125)
also:
- added `formatter_flags::quote_infinities_and_nans`
- made constructors for dates/times accept any integral types
- lots of internal work on formatter base (laying groundwork for more customization)
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)