Safe string operations and warning cleanup

Fixed --benchmark command line option

Merged win32-removal branch into master

Removed macOS-specific project files and remnants

Reduced meta-programming by converting macros to constexpr and inline functions

Implemented XDG Path Standardization and finalized cleanups

Eliminated wincompat.h and finalized architectural cleanup

Merged upstream rewrite of 6821 and AY8910 emulations

Modernize the Makefile

Cleaned up stale Windows-specific comments

Removed dead speech code and Win32 threading artifacts

Purged _WIN32 and WIN32 conditional blocks

Finalized Phase 3: Fixed string truncation warnings

Modernized configuration system with a C++ class

Merge branch '6821-rewrite-clean'