1.2.1

Update comments in DownloadProgressListener to English

1.2.0

Add enhanced FileDownloader with progress tracking and error handling

• Moved FileDownloader to a dedicated package.
• Added support for progress tracking via DownloadProgressListener.
• Introduced error handling with DownloadErrorType.
• Refactored download logic for better modularity.
• Updated dependencies and bumped version to 1.2.0.
• Added tests for file downloading functionality.
• Added FileUtil.getSha256Hex() method

1.1.0

• fix JsonUtility is not included
• add JsonUtil.rename method

1.0.0

initial release