Add additional functionality to the Sorcery API.

This commit adds native implementation support for copying and diffing objects,
as well as the ability to load or reload on a per-object type level.

Review: https://reviewboard.asterisk.org/r/2320/


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@381134 f38db490-d61c-443f-a65b-d21fe96a405b