[Core] Refactor color_utilities.h to modern C++20

[loumalouomega]

📝 Description

Modernize color_utilities.h by replacing the preprocessor-only implementation with typed C++20 constructs (constexpr, std::string_view, std::format), while preserving full backward compatibility through legacy macro aliases.

What changed

Before

• ~30 preprocessor #defines duplicated across #if !defined(_WIN32) / #else branches
• Color codes defined as raw string literal macros (#define KRED "\x1B[31m")
• Formatting macros relied on compile-time string literal concatenation (#define FRED(x) KRED x RST), which only works with string literals — not std::string or std::string_view
• No type safety, no namespace scoping, no IDE discoverability

After

• Kratos::ColorUtilities namespace with:
  • inline constexpr std::string_view constants for all ANSI codes (e.g. kRed, kBold, kReset)
  • [[nodiscard]] inline functions using std::format for text formatting (e.g. Red(), Bold(), Underline())
• Platform-conditional #if/#else only applies once to the constants — no duplication of formatting logic
• Backward-compatible macros (RST, KRED, FRED(x), BOLDFONT(x), etc.) are retained at the bottom and delegate to the namespace, so all existing call sites compile without changes

Why

Aspect	Old	New
Type safety	None (macros)	std::string_view params, std::string returns
Works with runtime strings	No (literal concat only)	Yes (std::string_view input)
Namespace pollution	Global	Scoped to Kratos::ColorUtilities
Code duplication	Full duplication in #if/#else	Constants only
IDE support	Macros — no autocomplete/go-to-def	Full IntelliSense support
Composability	BOLDFONT(FGRN("text")) works by accident	Bold(Green("text")) works by design

Impact

• No breaking changes — all existing callers (KYEL, BOLDFONT(FGRN("CONVERGED")), GetStream() << RST, etc.) continue to compile
• New code should prefer Kratos::ColorUtilities::Green("text") over FGRN("text")
• Legacy macros can be removed in a future PR once callers are migrated

🆕 Changelog

• Refactor color_utilities.h to modern C++20

[loumalouomega]

@roigcarlo as you said the C++20 support is not full, I will keep this until we update the Ubuntu images

[loumalouomega]

@roigcarlo as you said the C++20 support is not full, I will keep this until we update the Ubuntu images

See #14291