Replace references to tts.py with aiy.audio.say.

This change removes the duplicate tts.py. All references to say or
create_say in src/main.py have been replaced with aiy.audio.say.

src/action.py

@@ -204,7 +204,7 @@ def run(self, voice_command):
 # HEX RGB color and respond with 'ok'
 #
 # actor.add_keyword(_('change to ocean blue'), \
-# 		ChangeLightColor(say, "philips-hue", "Lounge Lamp", "0077be"))
+#              ChangeLightColor(say, "philips-hue", "Lounge Lamp", "0077be"))
 
 class ChangeLightColor(object):
 

src/main.py

@@ -30,7 +30,6 @@
 import action
 import i18n
 import speech
-import tts
 
 # =============================================================================
 #
@@ -198,7 +197,7 @@ def do_assistant_library(args, credentials, player, status_ui):
     env/bin/pip install google-assistant-library==0.0.2''')
         sys.exit(1)
 
-    say = tts.create_say(player)
+    say = aiy.audio.say
     actor = action.make_actor(say)
 
     def process_event(event):
@@ -235,8 +234,7 @@ def process_event(event):
 
 def do_recognition(args, recorder, recognizer, player, status_ui):
     """Configure and run the recognizer."""
-    say = tts.create_say(player)
-
+    say = aiy.audio.say
     actor = action.make_actor(say)
 
     if args.cloud_speech: