Introduce a MaterialSettingsVisibilityHandler that will only show those settings relevant for materials

Contriubtes to CURA-342

cura/Settings/MaterialSettingsVisibilityHandler.py

@@ -0,0 +1,19 @@
+# Copyright (c) 2016 Ultimaker B.V.
+# Uranium is released under the terms of the AGPLv3 or higher.
+
+import UM.Settings.Models
+
+class MaterialSettingsVisibilityHandler(UM.Settings.Models.SettingVisibilityHandler):
+    def __init__(self, parent = None, *args, **kwargs):
+        super().__init__(parent = parent, *args, **kwargs)
+
+        material_settings = set([
+            "material_print_temperature",
+            "material_bed_temperature",
+            "material_standby_temperature",
+            "cool_fan_speed",
+            "retraction_amount",
+            "retraction_speed",
+        ])
+
+        self.setVisible(material_settings)