* Add ATTR_PREFERRED_FORMAT to TTS for auto-converting audio
* Move conversion into SpeechManager
* Handle None case for expected_extension
* Only use ATTR_AUDIO_OUTPUT
* Prefer MP3 in pipelines
* Automatically convert to mp3 on demand
* Add preferred audio format
* Break out preferred format
* Add ATTR_BLOCKING to allow async fetching
* Make a copy of supported options
* Fix MaryTTS tests
* Update ESPHome to use "wav" instead of "raw"
* Clean up tests, remove blocking
* Clean up rest of TTS tests
* Fix ESPHome tests
* More test coverage
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