Refactor: Move private methods to anonymous namespace

[grunt-lucas]

Summary

• Moved private helper methods from class implementations to anonymous namespaces in their respective .cpp files
• Removed extensive private method documentation from header files to improve readability
• Cleaned up constructor parameter const qualifiers for better consistency

Changes

• ProjectCSourceFileAppender: Moved AppendToFile, ReadFile, and WriteFile methods to anonymous namespace
• TextualCSourceGenerator: Moved utility methods like ToLowercaseFilePath, GeneratePaletteIncludeLine, etc. to anonymous namespace
• Removed detailed private method documentation from header files
• Updated constructor parameter from const gsl::not_null<ProjectPaths *> to gsl::not_null<ProjectPaths *>

Benefits

• Cleaner header files with focus on public interface
• Better encapsulation of implementation details
• Follows project style guidelines for private helper functions
• Maintains all existing functionality while improving code organization

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