eina-cxx: Removed unecessary eo_refs.

eo_clone_allocator already handles that.
eolian-cxx: Use new Eolian API.
eina-cxx: Add EFL_CXX_NO_EXCEPTIONS compilation flag.

When defined disables the use of C++ exceptions in Eina++.
eolian-cxx: Remove efl::eina::iterator_iterator use.