Add Karatelight support (#487)

* Add Karatelight support

* Add Karatelight Schema

* Actually use the new schema file

* Put karate device to USB group in webinterface

libsrc/leddevice/schemas/schema-karate.json

@@ -0,0 +1,36 @@
+{
+	"type":"object",
+	"required":true,
+	"properties":{
+		"output": {
+			"type": "string",
+			"title":"edt_dev_spec_outputPath_title",
+			"default":"/dev/ttyACM0",
+			"propertyOrder" : 1
+		},
+		"rate": {
+			"type": "integer",
+			"title":"edt_dev_spec_baudrate_title",
+			"default": 1000000,
+			"propertyOrder" : 2
+		},
+		"delayAfterConnect": {
+			"type": "integer",
+			"title":"edt_dev_spec_delayAfterConnect_title",
+			"default": 1500,
+			"append" : "ms",
+			"propertyOrder" : 3
+		},
+		"latchTime": {
+			"type": "integer",
+			"title":"edt_dev_spec_latchtime_title",
+			"default": 15,
+			"append" : "edt_append_ms",
+			"minimum": 1,
+			"maximum": 1000,
+			"access" : "expert",
+			"propertyOrder" : 4
+		}
+	},
+	"additionalProperties": true
+}