_WD_GetTable: Support non-standard tables and improve speed

[Danp2]

Pull request

Proposed changes

Enhance _WD_GetTable to support overriding of default table markers

Checklist

Put an x in the boxes that apply. If you're unsure about any of them, don't hesitate to ask. We are here to help!
This is simply a reminder of what we are going to look for before merging your code.

• [x] I have read and noticed the CODE OF CONDUCT document
• [x] I have read and noticed the CONTRIBUTING document
• [ ] I have added necessary documentation or screenshots (if appropriate)

Types of changes

Please check x the type of change your PR introduces:

• [ ] Bugfix (change which fixes an issue)
• [x] Feature (change which adds functionality)
• [ ] Code style update (formatting, renaming)
• [x] Refactoring (functional, structural)
• [ ] Documentation content changes
• [ ] Other (please describe)

What is the current behavior?

Table markers are fixed.

What is the new behavior?

• Customizable table markers
• Drastically improved speed

Additional context

System under test