generate unique peer names

use unique-names-generator to generate peer names instead of relying on
UA. This prevents confusion when there are multiple clients on the network
with same UA.

server/package.json

@@ -10,6 +10,7 @@
   "license": "ISC",
   "dependencies": {
     "ua-parser-js": "^0.7.18",
+    "unique-names-generator": "^3.0.0",
     "ws": "^6.0.0"
   }
 }