Remove #include <utils/fileutils.h> from most header files

It has some platform specific warts, filepath.h is somewhat
cheaper and less ugly overall.

Partially clean up surroundings

Change-Id: Ida1fd470ec020f69c446109427f92a08e879789f
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>

src/plugins/mesonprojectmanager/buildoptions.h

@@ -3,7 +3,7 @@
 
 #pragma once
 
-#include <utils/fileutils.h>
+#include <utils/filepath.h>
 
 #include <QCheckBox>
 #include <QComboBox>

src/plugins/mesonprojectmanager/buildsystemfilesparser.h

@@ -0,0 +1,19 @@
+// Copyright (C) 2020 Alexis Jeandet.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#pragma once
+
+#include "common.h"
+#include "mesonpluginconstants.h"
+
+#include <QFile>
+#include <QJsonArray>
+#include <QJsonDocument>
+#include <QJsonObject>
+#include <QJsonValue>
+
+namespace MesonProjectManager {
+namespace Internal {
+
+} // namespace Internal
+} // namespace MesonProjectManager

src/plugins/mesonprojectmanager/projecttree.h

@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Alexis Jeandet.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#pragma once
+
+#include "mesoninfoparser.h"
+#include "mesonprojectnodes.h"
+
+#include <utils/filepath.h>
+
+namespace MesonProjectManager::Internal {
+
+class ProjectTree
+{
+public:
+    ProjectTree();
+    static std::unique_ptr<MesonProjectNode> buildTree(const Utils::FilePath &srcDir,
+                                                       const TargetsList &targets,
+                                                       const Utils::FilePaths &bsFiles);
+};
+
+} // MesonProjectManager::Internal

src/plugins/mesonprojectmanager/target.h

@@ -4,7 +4,7 @@
 #pragma once
 
 #include <utils/algorithm.h>
-#include <utils/fileutils.h>
+#include <utils/filepath.h>
 
 #include <QDir>
 #include <QVariant>