Add support for C++17.

[willson556]

Description

Adds support for C++17 using preprocessor directives to disable unsupported features.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Performance improvement
• Code refactoring
• Build/CI configuration change
• Other (please describe):

Related Issues

N/A

Changes Made

• Added macros for [[likely]] and [[unlikely]] attributes (these weren't introduced until C++20)
• Added NFX_STRINGBUILDER_HAS_STD_FORMAT define when std::format is available
• Extended Actions workflows to build with both C++20 and C++17.

Testing

• All existing tests pass
• Added new tests for changes
• Tested on Windows
• Tested on Linux
• Tested on macOS
• Benchmarks run (if performance-related)

Test Configuration

• Compiler(s):
• CMake version:
• Build type: Debug / Release / RelWithDebInfo

Documentation

• Updated code comments
• Updated Doxygen documentation
• Updated README.md
• Updated CHANGELOG.md
• No documentation needed

Breaking Changes

N/A

Checklist

• Code follows the project's coding style
• Self-review of code completed
• No compiler warnings introduced
• Changes are properly documented
• All tests pass locally
• No unnecessary debug code or comments left behind
• Commit messages are clear and descriptive

Screenshots / Output

Additional Notes

[willson556]

• Add support for C++17. #1 👈 (View in Graphite)
• main

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