Some fixes, some new features.

• Implemented Link-Time Optimization (Ineffective on GCC) (link-time-optimization.cmake)
• Better code-coverage usability on Windows (code-coverage.cmake)
• Fixed code coverage ccov-all targets when using CMake pre-3.17 (code-coverage.cmake)
• Fixed code-coverage ccov-all targets on Windows (code-coverage.cmake)
• Added standard C++23 function (c++-standards.cmake)
• Added macros for C-standards from C90 to C23 (c-standards.cmake)
• New per-target export option (code-coverage.cmake)
• Remove double-running of code-coverage targets (code-coverage.cmake)
• Can now combine multiple sanitizers in one build (sanitizers.cmake)
• Add new Control Flow sanitizer optin (sanitizers.cmake)
• Add ability to make AFL++ (american fuzzy lop) fuzz instrumented builds (afl-fuzzing.cmake)