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/mesonrunconfiguration.h

@@ -0,0 +1,27 @@
+// 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 <projectexplorer/runconfiguration.h>
+
+namespace MesonProjectManager {
+namespace Internal {
+
+class MesonRunConfiguration final : public ProjectExplorer::RunConfiguration
+{
+public:
+    MesonRunConfiguration(ProjectExplorer::Target *target, Utils::Id id);
+
+private:
+    void updateTargetInformation();
+};
+
+class MesonRunConfigurationFactory final : public ProjectExplorer::RunConfigurationFactory
+{
+public:
+    MesonRunConfigurationFactory();
+};
+
+} // namespace Internal
+} // namespace MesonProjectManager