Add bot_response() to API

ircbot.py

@@ -69,6 +69,10 @@ class API:
 		line = b'PRIVMSG ' + recipient + b' :' + message
 		self.serverthread_object.send_line_raw(line)
 
+	def bot_response(self, recipient, message):
+		"""Prefix message with ZWSP and convert from unicode to bytestring."""
+		self.msg(recipient, ('\u200b' + message).encode('utf-8'))
+
 	def nick(self, nick):
 		"""Send a NICK command and update the internal nick tracking state"""
 		with self.serverthread_object.nick_lock: