Changelog

Fixed rvalue row corruption bug on MSVC (info)
Fuxed some SFINAE issues
Added Cols... selector template parameter to at(), front() and back()
Added structs.mixins
Added copy-based fallbacks for unordered_erase(), insert(), emplace() and swap_columns() (previously they required movability)

Fixed swap_columns() fast-path breaking data()
Added spans
- Added span
- Added is_span<>
- Added table::subspan() and table::const_subspan()
- Added span_type<> and const_span_type<>
Added soa_type<>
Added const_iterator_type<>
Added const_row_type<>
Added column_indices<>
Added soagen::for_each_column()
Added row::for_each_column()
Added generic names first, second, ..., sixteenth for unnamed columns 0-15
Binary size improvements
Documentation improvements

Fixed soagen::is_table<>
Added support for emplace-constructing column values by unpacking all std::tuple-like types (not just the emplacer)
Added support for taking std::integral_constants in for_each_column()
Added soagen::same_table_type<>
Added conversions between soagen::row<> specializations
Optimized instantiation overhead for most type-traits

Added hpp.combined
Added std::integral_constant<size_t> to the overload set used by for_each_column()
Added support for constructing rows from all std::tuple-like types
Optimized bulk-swap operations