TTS tweaks

[jefforkin]

Now that TTS is working, there are a couple things we should do:

1. Adjust the pitch on the voices to sound like kids (other than Mr Jones)
2. Add a Text-to-Speech toggle in the Setup menu. Default to ON.

[dwenger01]

• Toggle is in the settings menu now.

• Modifying the pitch will require a modification to the tts python code to allow us to pass in an fx name ("Pitch") and an fx level ( some value in [-3, -2, -1, 0, 1, 2, 3]). I'll also need a way to associate the fx level with a role in project settings, and will need to pass in these values from the c# side where the RESTful API call is made.