Add support for FTEQW protocol

It's the same as binary really, Quake servers use this to distinguish what client type is being used.

websockify/websockifyserver.py

@@ -35,7 +35,9 @@ from websockify.websocketserver import WebSocketRequestHandlerMixIn
 class CompatibleWebSocket(WebSocket):
     def select_subprotocol(self, protocols):
         # Handle old websockify clients that still specify a sub-protocol
-        if 'binary' in protocols:
+        if 'fteqw' in protocols:
+            return 'fteqw'
+        elif 'binary' in protocols:
             return 'binary'
         else:
             return ''