New item type: Numerical answer
Issues #222 (closed) and #334 (closed)
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upgrade wax to v0.8.27 -
add item type "Numerical answer" and its starting data -
handle word export for item type "Numerical answer" -
handle QTI export for item type "Numerical answer" (single item export) -
exclude "Numerical answers" from list export, warn the user about it