Added machine action dialog optional

Based on this change, users will be able to run their machine action plugins code just by clicking the action button, so without having to open a modal.

cura/MachineAction.py

@@ -33,6 +33,7 @@ class MachineAction(QObject, PluginObject):
         self._qml_url = ""
         self._view = None
         self._finished = False
+        self._open_as_dialog = True
 
     labelChanged = pyqtSignal()
     onFinished = pyqtSignal()
@@ -79,6 +80,15 @@ class MachineAction(QObject, PluginObject):
 
         pass
 
+    @pyqtSlot()
+    def execute(self) -> None:
+        self._execute()
+    
+    def _execute(self) -> None:
+        """Protected implementation of execute."""
+        
+        pass
+
     @pyqtSlot()
     def setFinished(self) -> None:
         self._finished = True
@@ -115,6 +125,17 @@ class MachineAction(QObject, PluginObject):
     def getDisplayItem(self) -> Optional["QObject"]:
         return self._createViewFromQML()
 
+    @pyqtSlot(result = bool)
+    def openAsDialog(self) -> bool:
+        """Whether this action will show a dialog.
+
+         If not, the action will directly run the function inside execute().
+
+        :return: Defaults to true to be in line with the old behaviour.
+        """
+
+        return self._open_as_dialog
+
     @pyqtSlot(result = bool)
     def isVisible(self) -> bool:
         """Whether this action button will be visible.