Let the settingsMenu use the extruders of the active machine instead of the extruderModel

The extruder model gets updated way to much (for all material changes) but we only need the
number and names of the extruders, since the other menu's do this by themselves

cura/Settings/GlobalStack.py

@@ -3,8 +3,8 @@
 
 from collections import defaultdict
 import threading
-from typing import Any, Dict, Optional, Set, TYPE_CHECKING
-from PyQt5.QtCore import pyqtProperty, pyqtSlot
+from typing import Any, Dict, Optional, Set, TYPE_CHECKING, List
+from PyQt5.QtCore import pyqtProperty, pyqtSlot, pyqtSignal
 
 from UM.Decorators import override
 from UM.MimeTypeDatabase import MimeType, MimeTypeDatabase
@@ -42,13 +42,23 @@ class GlobalStack(CuraContainerStack):
         # Per thread we have our own resolving_settings, or strange things sometimes occur.
         self._resolving_settings = defaultdict(set) #type: Dict[str, Set[str]] # keys are thread names
 
+    extrudersChanged = pyqtSignal()
+
     ##  Get the list of extruders of this stack.
     #
     #   \return The extruders registered with this stack.
-    @pyqtProperty("QVariantMap")
+    @pyqtProperty("QVariantMap", notify = extrudersChanged)
     def extruders(self) -> Dict[str, "ExtruderStack"]:
         return self._extruders
 
+    @pyqtProperty("QVariantList", notify = extrudersChanged)
+    def extruderList(self) -> List["ExtruderStack"]:
+        result_tuple_list = sorted(list(self.extruders.items()), key=lambda x: int(x[0]))
+        result_list = [item[1] for item in result_tuple_list]
+
+        machine_extruder_count = self.getProperty("machine_extruder_count", "value")
+        return result_list[:machine_extruder_count]
+
     @classmethod
     def getLoadingPriority(cls) -> int:
         return 2