Meson: Flatten directory hierarchy

Keep tests/ and icons/ but put the rest into the toplevel.

The previous setup was so different from the rest of the bunch that
it regularly stuck out in maintenance tasks.

Change-Id: I69821be6268f69682353a388f6bb1fa343215303
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/mesonprojectmanager/toolsmodel.h

@@ -0,0 +1,39 @@
+// Copyright (C) 2020 Alexis Jeandet.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
+
+#pragma once
+
+#include "mesontools.h"
+
+#include <utils/treemodel.h>
+
+#include <QCoreApplication>
+#include <QQueue>
+
+namespace MesonProjectManager {
+namespace Internal {
+
+class ToolTreeItem;
+
+class ToolsModel final : public Utils::TreeModel<Utils::TreeItem, Utils::TreeItem, ToolTreeItem>
+{
+    Q_DECLARE_TR_FUNCTIONS(MesonProjectManager::Internal::ToolsSettingsPage)
+public:
+    ToolsModel();
+    ToolTreeItem *mesoneToolTreeItem(const QModelIndex &index) const;
+    void updateItem(const Utils::Id &itemId, const QString &name, const Utils::FilePath &exe);
+    void addMesonTool();
+    void removeMesonTool(ToolTreeItem *item);
+    ToolTreeItem *cloneMesonTool(ToolTreeItem *item);
+    void apply();
+
+private:
+    void addMesonTool(const MesonTools::Tool_t &);
+    QString uniqueName(const QString &baseName);
+    Utils::TreeItem *autoDetectedGroup() const;
+    Utils::TreeItem *manualGroup() const;
+    QQueue<Utils::Id> m_itemsToRemove;
+};
+
+} // namespace Internal
+} // namespace MesonProjectManager