Improve field finding in PDFs:

[BryceStevenWilley]

• Collapses multiple text lines with nothing in the middle (and nothing to the left, since often multiple fields can have their labels off to the left) into a text area
• detect the size of a text field, and roughly use it to set the font size so the text field is readable on PDFs with smaller font sizes
• add a checkbox detector that works for brackets "[ ]" by searching in PDF text for instances of [ ] or [ ]
• don't add duplicate field labels!
• fixed some issues with label bounding boxes being really big because it includes the field itself, which was causing some text to be labels for multiple fields, even it it wasn't that good of a choice
• skip over checkboxes that look like they're filled in (when using boxdetect), as they're likely false positives (we're only looking for empty checkboxes)
• don't add text boxes if:
  • there are things above the line that aren't blank
• Adds a script to run strip fields and run auto fields over all PDFs in a folder easily

Compare

Admittedly cherry-picked, but it's because we were pretty good before and not much changed in many forms except for font size. We were finding checkboxes, but I tweaked some params there to find more, because many were too small.

Before

After

[BryceStevenWilley]

~Draft until I patch the bracket checkbox finder (in https://github.com/SuffolkLITLab/FormFyxer/tree/better_brackets, will likely remove all of the special boxdetect code).~ Ready for review now! Currently running on some PDFs to make sure it's not worse on some PDFs, but trying not to get too held back by the results