Improve json:setElement(json, path, json.element) to replace values, API docs, and theme

[suhothayan]

Purpose

Improve usability and add missing features

Improve json:setElement(json, path, json.element) to replace existing values.
E.g
json:setElement(json, '$.item', 'book')

Here if the json is the format {'name' : 'Stationary', 'item' : 'pen'}, the function updates the >json as {'name' : 'John', 'item' : 'book'} by replacing 'item' element and returns the updated JSON.

Release note

Improve json:setElement(json, path, json.element) to replace existing
values.

Documentation

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