Make WPM customization available per-message basis

tfw/components/frontend/message_queue_handler/message_queue_handler.py

@@ -8,23 +8,15 @@ class MessageQueueHandler:
 
     def __init__(self, wpm):
         self.connector = None
-        self._wpm, self._cps = None, None
         self.wpm = wpm
         self._queue = Queue()
         self._thread = Thread(target=self._dispatch_messages)
 
-    @property
-    def wpm(self):
-        return self._wpm
-
-    @wpm.setter
-    def wpm(self, wpm):
-        self._wpm = wpm
-        self._cps = 5 * wpm / 60
-
     def _dispatch_messages(self):
         for message in iter(self._queue.get, None):
-            sleep(len(message['message'])/self._cps)
+            wpm = message['wpm'] if 'wpm' in message else self.wpm
+            cps = 5 * wpm / 60
+            sleep(len(message['message']) / cps)
             self.connector.send_message(message)
 
     def handle_event(self, message, _):