Some API models fixed according to schema

[oskin1]

Summary

• Fixed Utxo model
• Fixed ReferenceScript model
• Fixed adding get params to URL in transaction_output_from_reference

Type of Change

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• [ *] Breaking change (fix that would cause existing functionality to not work as expected)

Checklist

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• I have read the Contributing Guide
• My code follows the project's coding style and best practices
• My code is appropriately commented and includes relevant documentation
• I have added tests to cover my changes
• All new and existing tests pass
• I have updated the documentation, if necessary

Testing

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• Test A
• Test B

Additional Information

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