pidgin/pidgin

Use G_DECLARE_DERIVABLE_TYPE for PurpleConversation and additional cleanups

The setters for PurpleConversation are kind of crappy because of the
conversation cache in the purple_conversations api, which we'll address at a
later time.

Testing Done:
Compiled and ran locally, parted a chat and just signed out to verify no new issues.

Reviewed at https://reviews.imfreedom.org/r/613/
DOC_MODULE = 'facebook'
# Header files or dirs to ignore when scanning. Use base file/dir names
ignore_hfiles = [
]
# Extra options to supply to gtkdoc-scan.
scan_args = [
'--deprecated-guards=PURPLE_DISABLE_DEPRECATED',
'--rebuild-types',
'--rebuild-sections',
'--ignore-headers=' + ' '.join(ignore_hfiles),
]
# Extra options to supply to fixxref
fixxref_args = [
'--extra-dir=../../libpurple',
]
# Extra SGML files that are included by $(DOC_MAIN_XML_FILE).
content_files = [
libpurple_version_xml,
]
facebook_doc = gnome.gtkdoc(DOC_MODULE,
main_xml : DOC_MODULE + '-docs.xml',
src_dir : facebook_inc,
dependencies : facebook_dep,
install : true,
scan_args : scan_args,
fixxref_args : fixxref_args,
gobject_typesfile : DOC_MODULE + '.types',
content_files : content_files)