Move QML files to src/qml and don't use internal qml modules

src/qml/Dialog/OpenFileDialog.qml

@@ -0,0 +1,15 @@
+// SPDX-FileCopyrightText: 2019 Black Hat <bhat@encom.eu.org>
+// SPDX-License-Identifier: GPL-3.0-only
+
+import QtQuick 2.15
+import Qt.labs.platform 1.1
+
+FileDialog {
+    signal chosen(string path)
+
+    id: root
+
+    title: i18n("Please choose a file")
+
+    onAccepted: chosen(file)
+}