JSONSerilizable base class is hacky - needs improvement

[thomasms]

For output objects, they extend the JSONSerializable class to allow all data to be (de)serialized to/from JSON easily. However, the code is for deserialization is not well implemented, since extending this for lists of types is difficult. Additionally, the code is slow when trying to parse JSON output data, (really slow compared to other json libraries).

This could be improved and refactored, if anyone is willing to attempt this.

[github-actions]

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