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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# Aleksandar Urosevic <urke@users.sourceforge.net>, 2003-2004
# Danilo Segan <dsegan@gmx.net>, 2003-2005
# Filip Miletic <f.miletic@ewi.tudelft.nl>, 2004
# Miloš Popović <gpopac@gmail.com>, 2007-2009
# Nikola Kotur <kotnik@ns-linux.org>, 2006
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