Dapper by source to extend the Dapper classes without making changes to
the Dapper source (for instance in order to expand DynamicParameter with
a method HasValue<T>(string name)). In addition to further help developers
that reference Dapper by source the public property of Dapper classes are
moved to separate partial classes. By default the previous behavior is kept
but when referencing by source you can now make the Dapper classes internal
by defining: DAPPER_MAKE_PRIVATE