Feature/issue 2328

[prosenkiewicz]

Implemented support for Ivona text to speach

[devs-mycroft]

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[krisgesling]

Hi there, apologies that this hasn't been properly reviewed previously. We're actually planning to add a plugin system for audio backends, STT and TTS services.

This system will allow users (or developers configuring Mycroft for use in other projects) to pull in these services as they're needed rather than having them all included by default on every Mycroft installation. The aim is to keep mycroft-core lighter but still provide the same level of features and customization through the provision of these plugins.

So I'm going to close this PR but only because it won't need to be included in mycroft-core. We'll be transitioning all of these out to be independent plugins as per #2701 and can include this service in that work.

Thanks