Make the discovered cloud printers model generic

Removed the dependency of the DiscoveredCloudPrintersModel on CloudOutputDevice,
which is Ultimaker specific. This can allow even external plugins to add to this
model in the future.

CURA-7022

cura/Machines/Models/DiscoveredCloudPrintersModel.py

@@ -0,0 +1,60 @@
+from typing import Optional, TYPE_CHECKING, List, Dict
+
+from PyQt5.QtCore import QObject, pyqtSlot, Qt, pyqtSignal, pyqtProperty
+
+from UM.Qt.ListModel import ListModel
+
+if TYPE_CHECKING:
+    from cura.CuraApplication import CuraApplication
+
+
+class DiscoveredCloudPrintersModel(ListModel):
+    DeviceKeyRole = Qt.UserRole + 1
+    DeviceNameRole = Qt.UserRole + 2
+    DeviceTypeRole = Qt.UserRole + 3
+    DeviceFirmwareVersionRole = Qt.UserRole + 4
+
+    cloudPrintersDetectedChanged = pyqtSignal(bool)
+
+    def __init__(self, application: "CuraApplication", parent: Optional["QObject"] = None) -> None:
+        super().__init__(parent)
+
+        self.addRoleName(self.DeviceKeyRole, "key")
+        self.addRoleName(self.DeviceNameRole, "name")
+        self.addRoleName(self.DeviceTypeRole, "machine_type")
+        self.addRoleName(self.DeviceFirmwareVersionRole, "firmware_version")
+
+        self._discovered_ultimaker_cloud_printers_list = []  # type: List[Dict[str, str]]
+        self._new_cloud_printers_detected = False  # type: bool
+        self._application = application  # type: CuraApplication
+
+    def addDiscoveredCloudPrinters(self, new_devices: List[Dict[str, str]]) -> None:
+        self._discovered_ultimaker_cloud_printers_list.extend(new_devices)
+        self._update()
+
+        # Inform whether new cloud printers have been detected. If they have, the welcome wizard can close.
+        self._new_cloud_printers_detected = len(new_devices) > 0
+        self.cloudPrintersDetectedChanged.emit(len(new_devices) > 0)
+
+    @pyqtSlot()
+    def clear(self) -> None:
+        self._discovered_ultimaker_cloud_printers_list = []
+        self._update()
+        self._new_cloud_printers_detected = False
+        self.cloudPrintersDetectedChanged.emit(False)
+
+    def _update(self) -> None:
+        items = []
+
+        for cloud_printer in self._discovered_ultimaker_cloud_printers_list:
+            items.append(cloud_printer)
+
+        # Execute all filters.
+        filtered_items = list(items)
+
+        filtered_items.sort(key = lambda k: k["name"])
+        self.setItems(filtered_items)
+
+    @pyqtProperty(bool, notify = cloudPrintersDetectedChanged)
+    def newCloudPrintersDetected(self) -> bool:
+        return self._new_cloud_printers_detected