Open selects

[Guillermo Gutiérrez]

https://forum.opendatakit.org/t/allow-custom-choices-for-selects-that-get-saved-to-the-same-field-xforms-open-selects/22788

• xfroms-specs issue: getodk/xforms-spec#249
• javarosa issue
• collect issue

[Dr. Gareth S. Bestor]

FYI I implemented open selections for iXForms, so I have some ideas (eg how to display, etc) and insight that might be useful for a Collect implementation