- Updated the `MusicEditor` class to integrate a new playback engine (`emu::Apu`) for real-time music playback.
- Refactored UI components to improve the music editing experience, including dynamic song selection and enhanced visualization of music data.
- Introduced methods for starting and stopping playback, along with a new tracker view for displaying song patterns and commands.
- Removed obsolete methods and streamlined the drawing functions for better maintainability and clarity.
- Added detailed implementation plans as comments to guide future development and feature integration.
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