json-pointer-decode encoded strings

[ericpromislow]

Addresses issue #576

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[ericpromislow]

I looked at modifying the testdata to add a test-case that this PR addresses, but see that the test files like golden.v3.json are generated based on the go files that implement a web service and their types, and therefore we can't add an entry to the JSON file that has an XRef with encoded /s