split the controllers into separate files

owrx/controllers/websocket.py

@@ -0,0 +1,10 @@
+from . import Controller
+from owrx.websocket import WebSocketConnection
+from owrx.connection import WebSocketMessageHandler
+
+
+class WebSocketController(Controller):
+    def handle_request(self):
+        conn = WebSocketConnection(self.handler, WebSocketMessageHandler())
+        # enter read loop
+        conn.handle()