Adapted queue iterator to return structs

[diondokter]

Fixes #37

[github-actions]

PR build size diff

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  -1.6% -12.9Ki  -1.9%   -1004    TOTAL

[github-actions]

PR build size diff

    FILE SIZE        VM SIZE    
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 -30.6%     -19  [ = ]       0    [Unmapped]
  -0.4%     -40  [ = ]       0    .debug_aranges
  -0.7%    -120  [ = ]       0    .debug_frame
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  -1.5% -3.98Ki  [ = ]       0    .debug_str
  -1.6% -12.9Ki  -1.9%   -1004    TOTAL

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PR build size diff

    FILE SIZE        VM SIZE    
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 -32.3%     -20  [ = ]       0    [Unmapped]
  -0.4%     -40  [ = ]       0    .debug_aranges
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  -1.5% -3.98Ki  [ = ]       0    .debug_str
  -1.6% -12.9Ki  -1.9%   -1004    TOTAL

[github-actions]

PR build size diff

    FILE SIZE        VM SIZE    
 --------------  -------------- 
 -29.0%     -18  [ = ]       0    [Unmapped]
  -0.4%     -40  [ = ]       0    .debug_aranges
  -0.7%    -120  [ = ]       0    .debug_frame
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  -1.6% -12.9Ki  -1.9%   -1004    TOTAL