Utils: Move DiffUtils::interpolate into MathUtils

Change-Id: Iac4a21a6c760d8fbf0dce380b1a9a587a9d3468e
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/libs/utils/mathutils.h

@@ -0,0 +1,12 @@
+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
+
+#pragma once
+
+#include "utils_global.h"
+
+namespace Utils::MathUtils {
+
+QTCREATOR_UTILS_EXPORT int interpolate(int x, int x1, int x2, int y1, int y2);
+
+} // namespace Utils::Math