new classes Local::Date for delta_business_days calculations using Date::Calendar, and Local::Types using Type::Library to define 'isa' types for Moo classes

adapted Local::DB to cache DBIx::Simple object for sharing between eg RequestForm app & its test scripts; Local:: sub-classes of DBIx::Lite to provide DBIx::Simple methods (hashes, arrays, map, etc); test script for Local::DBIx::Lite (broken - needs fixing)