9783: XLSForm export (part 1)

[plastichotsprings]

Implements a new option to export forms to the XLSForm standard.

• On a form page, click "Export XLSForm"

• The exported XLSForm is nearly fully compatible; there are some question types in NEMO that don't exist in XLSForm; these are converted into a usable alternative, e.g., "long text" -> "text".

• Two NEMO question types, "signature" and "sketch" are not yet supported

Known issues:

• NEMO can do multiple "levels" of option sets but XLSForm lays out each option set separately in a flat structure. This should be converted.

[plastichotsprings]

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whyyyy

[cooperka]

remaining specs are flappers. merging!