- add integer and string version of the APIs,
- Also Refine the APIs, return value to indicate the setting existance
and a new param to return the value of the setting.
- add their lua bindings as well, in lua binding the return value nil
indicates that the setting is not defnied.
- Add corresponding C and lua tests as well.
- Add a few handy debug msgs.
The component loader is a more generic and extensible mechanism
of loading components; modules are one type of component...
The idea is to make scripts and config files also be components,
loaded by plugins that inherit WpComponentLoader
