see https://github.com/toml-lang/toml/issues/698 for info about TOML v1.0.0
also:
- fixed some parser error-paths not returning early enough when exceptions were disabled
- added more specific error messages for parsing errors relating to prohibited codepoints
- added compilation speed improvements (particularly for platforms lacking floating-point `std::to_chars`)
- added many minor documentation improvements
- added additional tests
