Add peripheral class

It has a non-human-readable type for the plug-ins to use and a human-readable name which can be requested with the peripherals() property.

Contributes to issue CURA-6651.

cura/PrinterOutput/Peripheral.py

@@ -0,0 +1,17 @@
+# Copyright (c) 2019 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+##  Data class that represents a peripheral for a printer.
+#
+#   Output device plug-ins may specify that the printer has a certain set of
+#   peripherals. This set is then possibly shown in the interface of the monitor
+#   stage.
+class Peripheral:
+    ##  Constructs the peripheral.
+    #   \param id A unique ID for the peripheral object, like a MAC address or
+    #   some hardware ID.
+    #   \param type A unique ID for the type of peripheral.
+    #   \param name A human-readable name for the peripheral.
+    def __init__(self, type: str, name: str):
+        self.type = type
+        self.name = name