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-account-overview.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2021 Purism SPC
+ *
+ * This file is part of Calls.
+ *
+ * Calls is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Calls is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Calls.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Evangelos Ribeiro Tzaras <evangelos.tzaras@puri.sm>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ */
+
+#pragma once
+
+#include <handy.h>
+
+G_BEGIN_DECLS
+
+#define CALLS_TYPE_ACCOUNT_OVERVIEW (calls_account_overview_get_type ())
+
+G_DECLARE_FINAL_TYPE (CallsAccountOverview, calls_account_overview, CALLS, ACCOUNT_OVERVIEW, HdyWindow)
+
+CallsAccountOverview  *calls_account_overview_new                   (void);
+
+G_END_DECLS