Move Cura setting related classes to cura/Settings

Contributes to CURA-342

cura/Settings/__init__.py

@@ -1,2 +1,11 @@
+# Copyright (c) 2016 Ultimaker B.V.
+# Cura is released under the terms of the AGPLv3 or higher.
 
 from .MaterialSettingsVisibilityHandler import MaterialSettingsVisibilityHandler
+from .ContainerManager import ContainerManager
+from .ContainerSettingsModel import ContainerSettingsModel
+from .CuraContainerRegistry import CuraContainerRegistry
+from .ExtruderManager import ExtruderManager
+from .ExtrudersModel import ExtrudersModel
+from .MaterialSettingsVisibilityHandler import MaterialSettingsVisibilityHandler
+from .SettingOverrideDecorator import SettingOverrideDecorator