As part of the SM45->52 migration, a ScriptInterface becomes a wrapper
around a JSCompartment, not a JSContext, thus we ought to store private
data for the compartment and not the context.
This is a mass rename of CxPrivate to CmptPrivate to match that before
the actual changes.
Part of the SM52 migration, stage: SM45 compatible
Patch by: Itms
Tested By: Freagarach
Refs #4893
Differential Revision: https://code.wildfiregames.com/D3089
This was SVN commit r24177.
wraitii
ab5616b4c4