Added home head & bed

CL-541

cura/PrinterOutput/PrinterOutputController.py

@@ -30,4 +30,10 @@ class PrinterOutputController:
         pass
 
     def moveHead(self, printer: "PrinterOutputModel", x, y, z, speed):
+        pass
+
+    def homeBed(self, printer):
+        pass
+
+    def homeHead(self, printer):
         pass

cura/PrinterOutput/PrinterOutputModel.py

@@ -40,6 +40,14 @@ class PrinterOutputModel(QObject):
         self._can_pre_heat_bed = True
         self._can_control_manually = True
 
+    @pyqtSlot()
+    def homeHead(self):
+        self._controller.homeHead(self)
+
+    @pyqtSlot()
+    def homeBed(self):
+        self._controller.homeBed(self)
+
     @pyqtProperty("QVariantList", constant = True)
     def extruders(self):
         return self._extruders