Add setting to set the number of extruders

pronterface.py

@@ -196,6 +196,7 @@ class PronterWindow(MainWindow, pronsole.pronsole):
         monitorsetting = BooleanSetting("monitor", False)
         monitorsetting.hidden = True
         self.settings._add(monitorsetting)
+        self.settings._add(SpinSetting("extruders", 0, 1, 5, _("Extruders count"), _("Number of extruders"), "Printer"))
         self.settings._add(BuildDimensionsSetting("build_dimensions", "200x200x100+0+0+0+0+0+0", _("Build dimensions"), _("Dimensions of Build Platform\n & optional offset of origin\n & optional switch position\n\nExamples:\n   XXXxYYY\n   XXX,YYY,ZZZ\n   XXXxYYYxZZZ+OffX+OffY+OffZ\nXXXxYYYxZZZ+OffX+OffY+OffZ+HomeX+HomeY+HomeZ"), "Printer"))
         self.settings._add(BooleanSetting("clamp_jogging", False, _("Clamp manual moves"), _("Prevent manual moves from leaving the specified build dimensions"), "Printer"))
         self.settings._add(StringSetting("bgcolor", "#FFFFFF", _("Background color"), _("Pronterface background color"), "UI"))