Some final tweaks

Contributes to CURA-5595

cura/API/Interface/Settings.py

@@ -0,0 +1,33 @@
+# Copyright (c) 2018 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+from cura.CuraApplication import CuraApplication
+
+##  The Interface.Settings API provides a version-proof bridge between Cura's
+#   (currently) sidebar UI and plug-ins that hook into it.
+#
+#   Usage:
+#       ``from cura.API import CuraAPI
+#       api = CuraAPI()
+#       api.interface.settings.getContextMenuItems()
+#       data = {
+#           "name": "My Plugin Action",
+#           "iconName": "my-plugin-icon",
+#           "actions": my_menu_actions,
+#           "menu_item": MyPluginAction(self)
+#       }
+#       api.interface.settings.addContextMenuItem(data)``
+
+class Settings:
+    # Re-used instance of Cura:
+    application = CuraApplication.getInstance()  # type: CuraApplication
+
+    ##  Add items to the sidebar context menu.
+    #   \param menu_item dict containing the menu item to add.
+    def addContextMenuItem(self, menu_item: dict) -> None:
+        self.application.addSidebarCustomMenuItem(menu_item)
+
+    ##  Get all custom items currently added to the sidebar context menu.
+    #   \return List containing all custom context menu items.
+    def getContextMenuItems(self) -> list:
+        return self.application.getSidebarCustomMenuItems()