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/
# SOME DESCRIPTIVE TITLE.
# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
# This file is distributed under the same license as the PACKAGE package.
#
# Translators:
# Hizkuntza Politikarako Sailburuordetza <hizkpol@ej-gv.es>, 2005
# Iñaki Larrañaga Murgoitio <dooteo@zundan.com>, 2006
# Mikel Pascual Aldabaldetreku <mikel.paskual@gmail.com>, correct and translate more than 85%, 2009
# tamax, 2006
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"POT-Creation-Date: 2021-01-12 00:20-0600\n"
"PO-Revision-Date: 2017-09-19 19:20+0000\n"
"Last-Translator: Richard Laager <rlaager@wiktel.com>\n"