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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# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
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# Translators:
# AbdulAziz AlSharif <a.a-a.s@hotmail.com>, 2007
# aboo amnghr, 2014
# Afief Halumi <Afief.h@gmail.com>, 2007
# Ahmad Gharbeia <gharbeia@gmail.com>, 2008
# Hafid BENHADRIA <ghosn@php4arab.info>, 2003
# Khaled Hosny <khaledhosny@eglug.org>, 2007-2008
# Mohamed Magdy <alnokta@yahoo.com>, 2006
# Youssef Chahibi <chahibi@gmail.com>, 2007
# محمد سعد Mohamed SAAD <metehyi@free.fr>, 2006
# محيي الدين <tx99h4@hotmail.com>, 2014-2017
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"PO-Revision-Date: 2017-09-19 12:43+0000\n"
"Last-Translator: محيي الدين <tx99h4@hotmail.com>\n"