Clang: Decouple ConnectionClient and ClangCodeModel*

We want to reuse the connection client in other plugins. This is the first
step, the next step is refactoring the IPC mechanismn and move it up to
the IpcServer- and IpcClientInterface.

Change-Id: I6eb6db1e9bc18232c8df350a6303afd2edc68da8
Reviewed-by: Tim Jenssen <tim.jenssen@theqtcompany.com>

src/libs/clangbackendipc/ipcserverinterface.h

@@ -0,0 +1,38 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#pragma once
+
+#include "ipcinterface.h"
+
+namespace ClangBackEnd {
+
+class CMBIPC_EXPORT IpcServerInterface : public IpcInterface
+{
+public:
+
+};
+
+} // namespace ClangBackEnd