also added support for wide strings on Windows (closes#42):
- added wide-string path arg overloads of `parse()` and `parse_file()`
- added wide-string support to all relevant `table` and `array` ops
- added `std::wstring` support to `node::value()` and `node::value_or()`
- added `std::wstring` support to `node_view::value()` and `node_view::value_or()`
- added wide-string overloads of `table::operator[]`
- added wide-string overloads of `node_view::operator[]`
- added `source_region::wide_path()`
- added `TOML_WINDOWS_COMPAT` switch for explicitly enabling/disabling this stuff
also:
- fixed internal macro `assert_or_assume` leaking out of `toml_parser.hpp`
- deprecated `node_view::get()` in favour of `node_view::node()`
- minor documentation fixes
- minor cleanup
- added doxygen page for the configuration options
- added SPDX-License-Identifiers around the place
- changed TOML_UNRELEASED_FEATURES default to 0
- simplified ABI namespace machinery
- fixed a number of doxygen bugs
also:
- fixed parser not handling floats with leading '.' characters
- added `TOML_PARSER` configuration option
- added `TOML_LIB_SINGLE_HEADER` indicator
- moved parse_error and the utf8 stream machinery to separate headers
- updated catch2
