Move models around again

- Move machine related models to cura.Machines.Models
 - Move printer device related models to cura.PrinterOutput.Models
 - Other UI/GUI related modules in cura.UI

cura/PrinterOutput/Models/ExtruderConfigurationModel.py

@@ -0,0 +1,70 @@
+# Copyright (c) 2018 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+from typing import Optional
+
+from PyQt5.QtCore import pyqtProperty, QObject, pyqtSignal
+
+from cura.UI.MaterialOutputModel import MaterialOutputModel
+
+
+class ExtruderConfigurationModel(QObject):
+
+    extruderConfigurationChanged = pyqtSignal()
+
+    def __init__(self, position: int = -1) -> None:
+        super().__init__()
+        self._position = position  # type: int
+        self._material = None  # type: Optional[MaterialOutputModel]
+        self._hotend_id = None  # type: Optional[str]
+
+    def setPosition(self, position: int) -> None:
+        self._position = position
+
+    @pyqtProperty(int, fset = setPosition, notify = extruderConfigurationChanged)
+    def position(self) -> int:
+        return self._position
+
+    def setMaterial(self, material: Optional[MaterialOutputModel]) -> None:
+        if self._hotend_id != material:
+            self._material = material
+            self.extruderConfigurationChanged.emit()
+
+    @pyqtProperty(QObject, fset = setMaterial, notify = extruderConfigurationChanged)
+    def activeMaterial(self) -> Optional[MaterialOutputModel]:
+        return self._material
+
+    @pyqtProperty(QObject, fset=setMaterial, notify=extruderConfigurationChanged)
+    def material(self) -> Optional[MaterialOutputModel]:
+        return self._material
+
+    def setHotendID(self, hotend_id: Optional[str]) -> None:
+        if self._hotend_id != hotend_id:
+            self._hotend_id = hotend_id
+            self.extruderConfigurationChanged.emit()
+
+    @pyqtProperty(str, fset = setHotendID, notify = extruderConfigurationChanged)
+    def hotendID(self) -> Optional[str]:
+        return self._hotend_id
+
+    ##  This method is intended to indicate whether the configuration is valid or not.
+    #   The method checks if the mandatory fields are or not set
+    #   At this moment is always valid since we allow to have empty material and variants.
+    def isValid(self) -> bool:
+        return True
+
+    def __str__(self) -> str:
+        message_chunks = []
+        message_chunks.append("Position: " + str(self._position))
+        message_chunks.append("-")
+        message_chunks.append("Material: " + self.activeMaterial.type if self.activeMaterial else "empty")
+        message_chunks.append("-")
+        message_chunks.append("HotendID: " + self.hotendID if self.hotendID else "empty")
+        return " ".join(message_chunks)
+
+    def __eq__(self, other) -> bool:
+        return hash(self) == hash(other)
+
+    #   Calculating a hash function using the position of the extruder, the material GUID and the hotend id to check if is
+    #   unique within a set
+    def __hash__(self):
+        return hash(self._position) ^ (hash(self._material.guid) if self._material is not None else hash(0)) ^ hash(self._hotend_id)