This commit introduces several improvements to the macOS update process,
primarily focusing on enhancing security and reliability:
- Add data integrity checks to ensure downloaded updates haven't been
tampered with.
- Optimize update progress logging in `streamWithProgress` by limiting
amount of logs during the download process.
- Improve resource management by ensuring proper closure of file
read/write streams.
- Add retry logic with exponential back-off during file access to handle
occassionally seen file system preparation delays on macOS.
- Improve decision-making based on user responses.
- Improve clarity and informativeness of log messages.
- Update error dialogs for better user guidance when updates fail to
download, unexpected errors occur or the installer can't be opened.
- Add handling for unexpected errors during the update process.
- Move to asynchronous functions for more efficient operation.
- Move to scoped imports for better code clarity.
- Update `Readable` stream type to a more modern variant in Node.
- Refactor `ManualUpdater` for improved separation of concerns.
- Document the secure update process, and log directory locations.
- Rename files to more accurately reflect their purpose.
- Add `.DS_Store` in `.gitignore` to avoid unintended files in commits.
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