pidgin/pidgin

Convert credentials page to use HdyPreferencesGroup and a list box.

2021-05-12, Elliott Sales de Andrade
68c7ef6c5320
Convert credentials page to use HdyPreferencesGroup and a list box.

* Convert credentials page to use `HdyPreferencesGroup` and a list box.
* Add widget for displaying a credential provider in a list box.
* Convert `PidginCredentialsPage` into `HdyPreferencesPage`.

Testing Done:
Opened Preferences, switch to Credentials page, and see/toggle selected provider.

Reviewed at https://reviews.imfreedom.org/r/644/
pidgin3_xml = configure_file(
input : 'pidgin3.xml.in',
output : 'pidgin3.xml',
configuration : version_conf,
install : true,
install_dir : get_option('datadir') / 'glade/catalogs')