feat/ww fallback

[JarbasAl]

allow hotword config to specify alternative ww to load on failure, this allows to recursively specify plugins in config and load the best one available

    "hey_mycroft": {
        "module": "ovos-ww-plugin-precise-lite",
        "model": "https://github.com/OpenVoiceOS/precise-lite-models/raw/master/wakewords/en/hey_mycroft.tflite",
        "expected_duration": 3,
        "trigger_level": 3,
        "sensitivity": 0.5,
        "listen": true,
        "fallback_ww": "hey_mycroft_precise"
    },
    "hey_mycroft_precise": {
        "module": "ovos-ww-plugin-precise",
        "version": "0.3",
        "model": "https://github.com/MycroftAI/precise-data/raw/models-dev/hey-mycroft.tar.gz",
        "expected_duration": 3,
        "trigger_level": 3,
        "sensitivity": 0.5,
        "listen": true,
        "fallback_ww": "hey_mycroft_vosk"
    },
    "hey_mycroft_vosk": {
        "module": "ovos-ww-plugin-vosk",
        "samples": ["hey mycroft", "hey microsoft", "hey mike roft", "hey minecraft"],
        "rule": "fuzzy",
        "listen": true,
        "fallback_ww": "hey_mycroft_pocketsphinx"
    },
    "hey_mycroft_pocketsphinx": {
        "module": "ovos-ww-plugin-pocketsphinx",
        "phonemes": "HH EY . M AY K R AO F T",
        "threshold": 1e-90,
        "lang": "en-us",
        "listen": true
    }

[codecov]

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