Add trie functions foreach/2, iter/2, and itera/3.
Add trie functions foreach/2, iter/2, and itera/3.

CloudI/CloudI,CloudI/CloudI,CloudI/CloudI,CloudI/CloudI,CloudI/CloudI,CloudI/CloudI,CloudI/CloudI,CloudI/CloudI,CloudI/CloudI,CloudI/CloudI,CloudI/CloudI