Optimize away repeated map finds for getParameterEntry* functions

[akleshchev]

getParameterEntry gets used extensively ans is rather pricey for what it does (map search)

This is a contribution by rye to optimize some of those calls away. #5206

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[Dan-Linden]

Is there anything to test?

[akleshchev]

This appears to be a code-only optimization. Related logic: gltf, meshes.