Foundation Classes - Optimize Quantity package (#834)

Foundation Classes - Optimize Quantity package (#834)

- Converted validation macros to inline functions for better type safety
- Added `noexcept` specifiers to non-throwing functions for compiler optimization opportunities
- Added `constexpr` to compile-time evaluable functions (comparison operators, leap year calculation)
- Enhanced `Quantity_Color::StringName()` to return "UNDEFINED" instead of throwing exceptions
- Introduced shared time constants header for better maintainability