/// Returns all of the defined values from the given enum type <typeparamref name="T"/> which are contained in <paramref name="combinedFlag"/>.
/// Note that, if combined flags are defined in <typeparamref name="T"/>, and <paramref name="combinedFlag"/> contains them, they will also be returned.
/// </summary>
/// <param name="combinedFlag">The combined flags whose individual flags to return.</param>
/// <param name="includeZero">Whether the enum value 0 should also be returned, if <typeparamref name="T"/> contains one.</param>
/// <typeparam name="T">The type of enum.</typeparam>
/// <returns>All of the flags that make up <paramref name="combinedFlag"/>.</returns>