New ConfigDataProxy

Previously, if SandstormConfigIF changes dynamically, the config data 
sections wont see the changes unless they are recreated
(technically requires destroy>unload>load>init the stage again).

Now, with the new ConfigDataProxy, we have a 'viewport' on the 
SandstormConfigIF, so the config changes are seen immediately!

Note that we can also use immutable ConfigData (see 
sandStormMgr.COPY_CONFIG_DATA).

But, I am wondering if the handler want to be notified when a config 
property changes?  If yes, we could create a ConfigChangeListener and 
add ConfigDataIF.addConfigChangeListener method.

What do you think?


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