Added Google TTS, lowercase voices so that people don't have to remember ridiculous case

tts/azure/index.js

@@ -10,7 +10,7 @@ module.exports = class AzureTTS extends BaseEngine {
     }
 
     getDefaultVoice() {
-        return "";
+        return "Aria";
     }
 
     getSpeechFile(text, filepath, voice = this.getDefaultVoice(), params = {}) {
@@ -48,7 +48,7 @@ module.exports = class AzureTTS extends BaseEngine {
         json.forEach((voice) => {
             if (this.voices[voice.DisplayName]) {
                 if (voice.Name.includes('Neural')) {
-                    this.voices[voice.DisplayName] = voice.ShortName;
+                    this.voices[voice.DisplayName.toLowerCase()] = voice.ShortName;
                 }
             } else {
                 this.voices[voice.DisplayName] = voice.ShortName;