Develop strategy to prepopulate PDF

[Brian Lewis]

Moving the processing of PDF Survey forms into the open-source web application involves dealing with 3 key aspects currently handled through other means:

1. Generate the Pdf form.
2. Prepopulate an instance of the form for a particular school
3. Load the completed Pdf form’s data to the database.

(1) The intention is to move to LaTex, using hyperref addin.

(3) This is currently working by having the ability to extract the data from the pdf in Xfdf format, and passing this data to the uploader. Note that LaTeX generation for (1) introduces a complication resolved in #1391.

That leaves (2) to be resolved in this issue.

[Brian Lewis]

Considering https://kb.itextpdf.com/itext/chapter-4-making-a-pdf-interactive-net

[Brian Lewis]

feat(pdfsurvey): demonstration of simple working generate/prepopulate of form. Support for form name hierarchy based on ! delimiters, in both generate and upload

Resolves #1391, #1396

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