Change Aurora device support to cover additional Nanoleaf devices

* Support Nanoleaf LightPanels (aka Aurora) and Canvas
* Add Nanoleaf Device discovery
* Update SSDPDiscover to be generic for given services

libsrc/leddevice/schemas/schema-nanoleaf.json

@@ -0,0 +1,17 @@
+{
+	"type":"object",
+	"required":true,
+	"properties":{
+		"output": {
+			"type": "string",
+			"title":"edt_dev_spec_targetIpHost_title",
+			"propertyOrder" : 1
+		},
+		"token": {
+			"type": "string",
+			"title":"edt_dev_auth_key_title",
+			"propertyOrder" : 2
+		}
+	},
+	"additionalProperties": true
+}