Introduce CallsAccountOverview: A UI to allow managing VoIP accounts

CallsAccountOverview allows user to view, add and edit VoIP accounts
(currently SIP only).

Each CallsAccount is represented by a CallsAccountRow.

account-row: Staying alive

src/calls-application.c

@@ -350,6 +350,15 @@ copy_number (GSimpleAction *action,
   g_debug ("Copied `%s' to clipboard", number);
 }
 
+static void
+show_accounts (GSimpleAction *action,
+               GVariant      *parameter,
+               gpointer       user_data)
+{
+  CallsApplication *app = CALLS_APPLICATION (g_application_get_default ());
+  calls_main_window_show_accounts_overview (app->main_window);
+}
+
 static void
 manager_state_changed_cb (GApplication *application)
 {
@@ -366,6 +375,8 @@ static const GActionEntry actions[] =
   { "set-daemon", set_daemon_action, NULL },
   { "dial", dial_action, "s" },
   { "copy-number", copy_number, "s"},
+  /* TODO About dialog { "about", show_about, NULL}, */
+  { "accounts", show_accounts, NULL},
 };