PROTON-228: Added the TypeHelper class for working with complex types in Perl

This new type is modeled after a similar type in the Ruby language
bindings.

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1478919 13f79535-47bb-0310-9956-ffa450edef68
PROTON-228: Added helper class for Array type.

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1478920 13f79535-47bb-0310-9956-ffa450edef68
PROTON-228: Added missing get_list and get_map methods to Data.pm

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1478921 13f79535-47bb-0310-9956-ffa450edef68