Add basic qrcode functions

tests/unittests/ui/stub_ui.c

@@ -923,27 +923,38 @@ void
 cons_show_disco_items(GSList* items, const char* const jid)
 {
 }
+
 void
 cons_show_disco_info(const char* from, GSList* identities, GSList* features)
 {
 }
+
+void
+cons_show_omemo_qrcode(const char* const text)
+{
+}
+
 void
 cons_show_room_invite(const char* const invitor, const char* const room,
                       const char* const reason)
 {
 }
+
 void
 cons_check_version(gboolean not_available_msg)
 {
 }
+
 void
 cons_show_typing(const char* const barejid)
 {
 }
+
 void
 cons_show_incoming_room_message(const char* const nick, const char* const room, const int win_index, gboolean mention, GList* triggers, int unread, ProfWin* const window)
 {
 }
+
 void
 cons_show_incoming_message(const char* const short_from, const int win_index, int unread, ProfWin* const window)
 {