Start MachineSelector refactor by allowing list model to be passed in.

CURA-9424

plugins/MonitorStage/MonitorMenu.qml

@@ -19,5 +19,7 @@ Item
         width: UM.Theme.getSize("machine_selector_widget").width
         height: parent.height
         anchors.centerIn: parent
+
+        machineListModel: Cura.MachineListModel {}
     }
 }

plugins/PrepareStage/PrepareMenu.qml

@@ -55,6 +55,8 @@ Item
                 Layout.preferredWidth: parent.machineSelectorWidth
                 Layout.fillWidth: true
                 Layout.fillHeight: true
+
+                machineListModel: Cura.MachineListModel {}
             }
 
             Cura.ConfigurationMenu

resources/qml/PrinterSelector/MachineSelector.qml

@@ -16,6 +16,8 @@ Cura.ExpandablePopup
     property bool isCloudRegistered: Cura.MachineManager.activeMachineHasCloudRegistration
     property bool isGroup: Cura.MachineManager.activeMachineIsGroup
 
+    property alias machineListModel: machineSelectorList.model
+
     readonly property string connectionStatus: {
         if (isNetworkPrinter)
         {
@@ -156,7 +158,8 @@ Cura.ExpandablePopup
 
         }
 
-        MouseArea // Connection status tooltip hover area
+        // Connection status tooltip hover area
+        MouseArea
         {
             id: connectionStatusTooltipHoverArea
             anchors.fill: parent

resources/qml/PrinterSelector/MachineSelectorList.qml

@@ -10,7 +10,6 @@ import Cura 1.0 as Cura
 ListView
 {
     id: listView
-    model: Cura.MachineListModel {}
     section.property: "isOnline"
     property real contentHeight: childrenRect.height