Use devices.json for discovery

* Usese devices.json from "tuya-cli wizard" for device discovery, no topic config required
* Uses device discovery by default, but can manually edit devices.json to add IP address, protocol version, or change
* Creates short topic name using just "friendly name" or "id".

package.json

@@ -1,6 +1,6 @@
 {
   "name": "tuya-mqtt",
-  "version": "2.1.0",
+  "version": "3.0.0-beta1",
   "description": "Control Tuya devices locally via MQTT",
   "homepage": "https://github.com/TheAgentK/tuya-mqtt#readme",
   "main": "tuya-mqtt.js",
@@ -16,7 +16,8 @@
     "color-convert": "^2.0.1",
     "debug": "^4.1.1",
     "mqtt": "^4.2.1",
-    "tuyapi": "^5.3.1"
+    "tuyapi": "^5.3.1",
+    "json5": "^2.1.3"
   },
   "repository": {
     "type": "git",