- Add IconRc struct for loading icons from executable or .ico files
- Implement LoadIconRcError for icon loading error handling
- Add StrRc struct for loading string resources from files
- Implement LoadStrRcError for string loading error handling
- Remove old Icon struct and related error types
- Update tests to use new resource loading implementations
- Add Windows Resource section with proper documentation
- Include Win32_System_LibraryLoader feature in Cargo.toml
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