Fixes:

• fixed linkage error with windows compat mode
• fixed TOML_CONSTEVAL broken in MSVC (again)
• fixed minor documentation bugs
• fixed cmake project version being incorrect (#110) (@GiulioRomualdi)

Additions:

• added support for lowercase 't' and 'z' in datetimes (per spec)
• added natvis file to cmake install (#106) (@Ryan-rsm-McKenzie)
• added VS cpp.hint file to cmake install
• added metafunctions is_container, is_chronological, is_value, is_node, inserted_type_of

Changes:

• improved debug code size by removing unnecessary std::forwards and std::moves
• modernized the CMake build files (#102, #103, #105) (@friendlyanon)
• updated conformance tests