TextEditor: Remove copy and move in AssistProposalItemInterface

You should not not copy it anyway and it provides problems if you use move
only data types.

Change-Id: If9eab1ca265d89ccab9d947a534820da359d6054
Reviewed-by: Tim Jenssen <tim.jenssen@theqtcompany.com>

src/libs/utils/declarationmacros.h

@@ -0,0 +1,33 @@
+/****************************************************************************
+**
+** 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
+
+#define UTILS_DELETE_MOVE_AND_COPY(Class) \
+    Class(const Class&) = delete; \
+    Class &operator=(const Class&) = delete; \
+    Class(Class&&) = delete; \
+    Class &operator=(Class&&) = delete;
+