Reintroduce Vector comparison operator

Since it can be used for integer vector, also fixed comparison
technique.


Former-commit-id: 3a193ed21beb4d9b7d311eb29bc2852b0776a41c

include/Nazara/Math/Vector4.inl

@@ -425,6 +425,43 @@ bool NzVector4<T>::operator!=(const NzVector4& vec) const
 	return !operator==(vec);
 }
 
+template<typename T>
+bool NzVector4<T>::operator<(const NzVector4& vec) const
+{
+	if (x == vec.x)
+	{
+		if (y == vec.y)
+		{
+			if (z == vec.z)
+				return w < vec.w;
+			else
+				return z < vec.z;
+		}
+		else
+			return y < vec.y;
+	}
+	else
+		return x < vec.x;
+}
+
+template<typename T>
+bool NzVector4<T>::operator<=(const NzVector4& vec) const
+{
+	return operator<(vec) || operator==(vec);
+}
+
+template<typename T>
+bool NzVector3<T>::operator>(const NzVector3& vec) const
+{
+	return !operator<=(vec);
+}
+
+template<typename T>
+bool NzVector3<T>::operator>=(const NzVector3& vec) const
+{
+	return !operator<(vec);
+}
+
 template<typename T>
 NzVector4<T> NzVector4<T>::UnitX()
 {