Merge CppTools into CppEditor

There was no proper separation of responsibilities between these
plugins. In particular, CppTools had lots of editor-related
functionality, so it's not clear why it was separated out in the first
place.
In fact, for a lot of code, it seemed quite arbitrary where it was put
(just one example: switchHeaderSource() was in CppTools, wheras
switchDeclarationDefinition() was in CppEditor).
Merging the plugins will enable us to get rid of various convoluted
pseudo-abstractions that were only introduced to keep up the artificial
separation.

Change-Id: Iafc3bce625b4794f6d4aa03df6cddc7f2d26716a
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/cppeditor/cppmodelmanagersupport.h

@@ -0,0 +1,78 @@
+/****************************************************************************
+**
+** 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 "cppeditor_global.h"
+
+#include <QSharedPointer>
+#include <QString>
+
+#include <memory>
+
+namespace TextEditor {
+class TextDocument;
+class BaseHoverHandler;
+} // namespace TextEditor
+
+namespace CppEditor {
+
+class AbstractOverviewModel;
+class BaseEditorDocumentProcessor;
+class CppCompletionAssistProvider;
+class FollowSymbolInterface;
+class RefactoringEngineInterface;
+
+class CPPEDITOR_EXPORT ModelManagerSupport
+{
+public:
+    using Ptr = QSharedPointer<ModelManagerSupport>;
+
+public:
+    virtual ~ModelManagerSupport() = 0;
+
+    virtual CppCompletionAssistProvider *completionAssistProvider() = 0;
+    virtual CppCompletionAssistProvider *functionHintAssistProvider() = 0;
+    virtual TextEditor::BaseHoverHandler *createHoverHandler() = 0;
+    virtual BaseEditorDocumentProcessor *createEditorDocumentProcessor(
+                TextEditor::TextDocument *baseTextDocument) = 0;
+    virtual FollowSymbolInterface &followSymbolInterface() = 0;
+    virtual RefactoringEngineInterface &refactoringEngineInterface() = 0;
+    virtual std::unique_ptr<AbstractOverviewModel> createOverviewModel() = 0;
+    virtual bool supportsOutline(const TextEditor::TextDocument *) const { return true; }
+};
+
+class CPPEDITOR_EXPORT ModelManagerSupportProvider
+{
+public:
+    virtual ~ModelManagerSupportProvider() = default;
+
+    virtual QString id() const = 0;
+    virtual QString displayName() const = 0;
+
+    virtual ModelManagerSupport::Ptr createModelManagerSupport() = 0;
+};
+
+} // CppEditor namespace