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This pull request adds a new tag called "manually_frozen" to the codebase. The tag is used to mark UTXOs as manually frozen or manually unfrozen. The code changes include adding the "IsManuallyFrozenTag" constant, updating the UTXO filtering logic to consider the new tag, and adding methods to retrieve the list of frozen UTXOs. This enhancement improves the flexibility and control over freezing and unfreezing UTXOs in the application.