Make it possible to select TTS engine when you add voice

[uezo]

Configure on application starts.

// Add AzureTTS as default engine
var azureTTSLoader = new AzureTTSLoader("YOUR API KEY");
modelController.RegisterTTSFunction("azure", azureTTSLoader.GetAudioClipAsync, true);

// Add Voiceroid
var voiceroidTTSLoader = new VoiceroidTTSLoader("ENDPOINT URL");
modelController.RegisterTTSFunction("voiceroid", voiceroidTTSLoader.GetAudioClipAsync);

Set Text-to-Speech Function name when create TTSConfig instance.

var ttsConfig = new TTSConfiguration("voiceroid");
ttsConfig.Params.Add("Volume", 2.5f);
animatedVoiceRequest.AddVoiceTTS("Hello", ttsConfig: ttsConfig);
animatedVoiceRequest.AddVoiceTTS("How are you?", ttsConfig: ttsConfig);