Add PageOrder setting as part of PageLayoutOptions

[imirkin]

This controls whether page numbers are assigned in a zig-zag going across first, or down first.

How Has This Been Tested

Verified that opening in Excel shows the "over then down" value, whereas "down then over" is used by default.

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[xuri]

Thanks for your PR. LGTM. Your last PR exported new function SetLegacyDrawingHF, I think rename it to SetHeaderFooterImage would be better, how about you think? You can change it in this PR if you think so.

[imirkin]

Thanks for your PR. LGTM. Your last PR exported new function SetLegacyDrawingHF, I think rename it to SetHeaderFooterImage would be better, how about you think? You can change it in this PR if you think so.

I think that's fine, but I'd prefer to keep the changes separate. Can I send a different PR to update it?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.20%. Comparing base (b7375bc) to head (807b724).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2022   +/-   ##
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  Coverage   99.20%   99.20%           
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  Files          32       32           
  Lines       29880    29895   +15     
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+ Hits        29642    29657   +15     
  Misses        158      158           
  Partials       80       80           

Flag	Coverage Δ
unittests	99.20% <100.00%> (+<0.01%)	⬆️

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[xuri]

Thanks for your PR. LGTM. Your last PR exported new function SetLegacyDrawingHF, I think rename it to SetHeaderFooterImage would be better, how about you think? You can change it in this PR if you think so.

I think that's fine, but I'd prefer to keep the changes separate. Can I send a different PR to update it?

Of course, sure. Thanks.

[xuri]

I made some changes based on your branch, to reduce cyclomatic complexity, added value check and error message for each option.