Replaced std::nullptr_t for boost::variant2::monostate in values
Added support for relational operators in value
Automatic docs generation
closes#48closes#46
- Added execute_params
- prepared_statement::execute with iterators overload has been replaced by
execute_params overload
- Added type requirement checks for ValueForwardIterator and
ValueCollection
- Removed distinction between row and owning_row
- Changed semantics for fetch_one to row& + bool
- Renamed all fetch_* fns to read_*
- Added row.clear()
