Add default google engine and Android 11 intent. #33
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Some mobile phone brands, for example samsung, bring their native tts engine and not google's. Often with some flaws in terms of quantity and quality in the languages/locale.
I came across this problem when the pt-PT locale and the samsung phone had its own default engine on the device and it gave a null response. The google engine must be used to have access to all the languages present in the documentation.
Also faced faced some compatibility problems related with the last android version:
Apps targeting Android 11 that use text-to-speech should declare TextToSpeech.Engine.INTENT_ACTION_TTS_SERVICE in the queries elements of their manifest.