Need ability to support lazy initialization definitions when using PythonConfig/@Object.
In the process of documenting PythonConfig, discovered that XMLConfig and YamlConfig were NOT handling lazy_init. Coded fixes and docs for those as well. Updated some test cases to demonstrate this.
Completed mods to add support for lazy_init to XMLConfig, YamlConfig, and PythonConfig. NOTE: NOT added to PyContainerConfig (we don't support any new mods to that format).