Treat FORM_TYPE field differently
A hidden field name FORM_TYPE
is treated in a special way, as specified in https://xmpp.org/extensions/xep-0068.html#usecases-correct.
Atm slixmpp doesn't do anything special about it and it's up to the user to know to check it/ignore it when looping over fields etc.
I would like us to propose an interface to retrieve/set it, and exclude a correct usage of it from .get_values
results. Probably breaking.
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