add Qt6 version of 'cl-repl'

examples/Qt6/cl-repl/qml/ext/MenuBack.qml

@@ -0,0 +1,54 @@
+import QtQuick
+import QtQuick.Controls
+import QtQuick.Controls.Basic
+
+Rectangle {
+  id: menuBack
+  width: main.width
+  height: backButton.height
+  color: "#f0f0f0"
+
+  property alias label: label.text
+
+  Button {
+    id: backButton
+    height: main.small ? 40 : 46
+    width: 80
+
+    background: Rectangle {
+      Text {
+        id: iconBack
+        x: 10
+        height: backButton.height
+        verticalAlignment: Text.AlignVCenter
+        font.family: fontAwesome.name
+        font.pixelSize: 32
+        color: "#007aff"
+        text: "\uf104"
+      }
+
+      Text {
+        x: 30
+        height: backButton.height * 1.1 // align correction (different font from above)
+        verticalAlignment: Text.AlignVCenter
+        font.pixelSize: 20
+        font.weight: Font.DemiBold
+        color: iconBack.color
+        text: "Repl"
+        visible: (Qt.platform.os === "ios")
+      }
+
+      implicitWidth: 90
+      color: menuBack.color
+    }
+
+    onPressed: Lisp.call("dialogs:exited")
+  }
+
+  Text {
+    id: label
+    anchors.centerIn: parent
+    font.pixelSize: 20
+    font.weight: Font.DemiBold
+  }
+}