Avoid manual handling of icons in request field list items
* Use `PurpleKeyValuePair` as field list items
* Replace `icons` list with `has_icons` flag, thus fixing memleak
* Replace `purple_request_field_list_get_icons` with `purple_request_field_list_has_icons`
Testing Done:
Compile and run.
Reviewed at https://reviews.imfreedom.org/r/563/
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# Jure Cuhalev <gandalf@owca.info>, 2003
# Jure Cuhalev <gandalf@owca.info>, 2003
# Martin Srebotnjak <miles@filmsi.net>, 2006,2013-2017
# Matjaž Horvat <matjaz@owca.info>, 2004
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