Implement Comprehensive Systems and Enhancements (bitvault-common)

- **Address Book System**: Add a new system to manage and store contact information securely.
- **Event System**: Develop an event-driven architecture for efficient handling of user interactions and system events.
- **Fee Estimation System**: Integrate an adaptive fee estimation system that adjusts based on network conditions and user preferences.
- **Key Management System**: Implement a robust key management system using AES-256-GCM encryption and PBKDF2-HMAC-SHA256 for secure key storage and retrieval.
- **Localization System**: Enhance user experience with a comprehensive localization system for error messages and UI elements.
- **Basic Wallet Operations**: Add components for initializing wallets, validating addresses, creating and signing transactions, and managing transaction history.
- **UTXO Selection Strategies**: Introduce advanced UTXO selection strategies, including MinimizeFee, MaximizePrivacy, Consolidate, OldestFirst, and CoinControl, to optimize transaction fees, privacy, and UTXO management.
- **Documentation Updates**: Update documentation with detailed guidance on UTXO selection, dependency management, and Bitcoin-specific testing strategies.
- **Security Enhancements**: Strengthen security by ensuring proper encryption and validation for data loaded from storage and implementing memory zeroization for sensitive data.
- **Testing and Validation**: Implement comprehensive testing strategies to ensure the reliability and security of new features and systems.

This commit significantly enhances the functionality, security, and user experience by introducing new systems and improving existing ones, aligning with the project's priorities of security, cross-platform compatibility, and Bitcoin protocol compliance.

Author: secsovereign