`emerald_import*` & `emerald_export*` doesn't embedded JSON objects as plain string values

https://stackoverflow.com/questions/7750399/how-to-encode-json-embedded-within-json

Like `"abi": "[{\"constant\":false,\"inputs\":[{\"name\":\"receiver\",\"type\":\"address\"},{\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"sendLoyaltyPoints\",\"outputs\":[],\"payable\":false,\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"familyMember\",\"type\":\"address\"}],\"name\":\"registerFamilyMember\",\"outputs\":[],\"payable\":false,\"type\":\"function\"},{\"constant\":false,\"inputs\":[],\"name\":\"EmiratesLoyaltyPoints\",\"outputs\":[],\"payable\":false,\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"addr\",\"type\":\"address\"}],\"name\":\"getBalance\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"type\":\"function\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"name\":\"from\",\"type\":\"address\"},{\"indexed\":true,\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Transfer\",\"type\":\"event\"}]"`.

Start by tracing the emerald_import* and emerald_export* entry points and compare their handling with the embedded JSON example in the issue. Verify how a JSON object stored as a plain string is imported and exported, then confirm that the value survives the round trip without losing its escaped contents.

Written by the indexing model from the issue text.