Moved the prepareMenu into the prepare stage plugin

CURA-5772

plugins/PrepareStage/PrepareMenu.qml

@@ -0,0 +1,42 @@
+import QtQuick 2.7
+
+import QtQuick.Controls 1.4
+
+import UM 1.3 as UM
+import Cura 1.1 as Cura
+
+
+Row
+{
+    spacing: UM.Theme.getSize("default_margin").width
+
+    UM.I18nCatalog
+    {
+        id: catalog
+        name:"cura"
+    }
+
+    Button
+    {
+        id: openFileButton;
+        text: catalog.i18nc("@action:button", "Open File");
+        iconSource: UM.Theme.getIcon("load")
+        style: UM.Theme.styles.tool_button
+        tooltip: ""
+        action: Cura.Actions.open;
+    }
+
+    Cura.MachineAndConfigurationSelector
+    {
+    }
+
+    Cura.MaterialAndVariantSelector
+    {
+        width: UM.Theme.getSize("sidebar").width
+    }
+
+    Cura.ProfileAndSettingComponent
+    {
+        width: UM.Theme.getSize("sidebar").width
+    }
+}