Dmx512 Rs232 support (#256)

* Started work on DMX512 rs232 device
cloned from sedu - no actual changes yet

* Implemented DMX protocol
Added baudrate debugging to ProviderRs232

* Added support for multiple DMX fixture types

libsrc/leddevice/schemas/schema-dmx.json

@@ -0,0 +1,29 @@
+{
+	"type":"object",
+	"required":true,
+	"properties":{
+		"output": {
+			"type": "string",
+			"title":"Output path",
+			"propertyOrder" : 1
+		},
+		"output": {
+			"type": "string",
+			"title":"DMX Device Type",
+			"propertyOrder" : 1
+		},
+		"rate": {
+			"type": "integer",
+			"title":"Baudrate",
+			"default": 250000,
+			"propertyOrder" : 2
+		},
+		"delayAfterConnect": {
+			"type": "integer",
+			"title":"Delay after connect",
+			"default": 250,
+			"propertyOrder" : 3
+		}
+	},
+	"additionalProperties": true
+}