gnome: clean up ringmainwindow.cpp

Define custom widgets in separate files and move
commonly used functions to utils:
- moved get_index_from_selection() to utils/models
- moved place_new_call() to utils/calling
- moved the contacts treeview to contactsview
- moved the history treeview to historyview

Refs #71530

Change-Id: Ia20e8d3bc3cfe997d38c880854205f063f0244a0
diff --git a/src/historyview.h b/src/historyview.h
new file mode 100644
index 0000000..1f4cb06
--- /dev/null
+++ b/src/historyview.h
@@ -0,0 +1,52 @@
+/*
+ *  Copyright (C) 2015 Savoir-Faire Linux Inc.
+ *  Author: Stepan Salenikovich <stepan.salenikovich@savoirfairelinux.com>
+ *
+ *  This program 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.
+ *
+ *  This program 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 this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.
+ *
+ *  Additional permission under GNU GPL version 3 section 7:
+ *
+ *  If you modify this program, or any covered work, by linking or
+ *  combining it with the OpenSSL project's OpenSSL library (or a
+ *  modified version of that library), containing parts covered by the
+ *  terms of the OpenSSL or SSLeay licenses, Savoir-Faire Linux Inc.
+ *  grants you additional permission to convey the resulting work.
+ *  Corresponding Source for a non-source form of such a combination
+ *  shall include the source code for the parts of OpenSSL used as well
+ *  as that of the covered work.
+ */
+
+#ifndef _HISTORYVIEW_H
+#define _HISTORYVIEW_H
+
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+#define HISTORY_VIEW_TYPE            (history_view_get_type ())
+#define HISTORY_VIEW(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), HISTORY_VIEW_TYPE, HistoryView))
+#define HISTORY_VIEW_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST((klass), HISTORY_VIEW_TYPE, HistoryViewClass))
+#define IS_HISTORY_VIEW(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj), HISTORY_VIEW_TYPE))
+#define IS_HISTORY_VIEW_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass), HISTORY_VIEW_TYPE))
+
+typedef struct _HistoryView      HistoryView;
+typedef struct _HistoryViewClass HistoryViewClass;
+
+GType      history_view_get_type (void) G_GNUC_CONST;
+GtkWidget *history_view_new      (void);
+
+G_END_DECLS
+
+#endif /* _HISTORYVIEW_H */