Add new output formatting system with flags for color and emoji control:
- Introduce OutputConfig and Writer structs for flexible output handling
- Add --colors and --emoji/--no-emoji global flags
- Refactor commands to use new Writer for consistent formatting
- Separate error content from presentation for better flexibility
Implement multihost functionality allowing separate management of common and host-specific dotfiles. Add new commands and flags for handling host-specific files, update core logic for file storage and tracking, and enhance documentation to reflect new capabilities.
