add basic implementations in Lambda
add factory lambdaFn
add Boolean.pm6, make exported lambda function constant (immutable)
add roles name and lambda to Base.pm6, add Test/Util.pm6 with &does_ok to test 'em
add ADT (Algebraic Data Type) List
add Y combinator
add C combinator ("swap-args")
add combinators I (id), K (const) and W (double-args, or *double-U*)