Change settings to offer default provider and voice/pitch/rate per language

[eeejay]

A default voice does not make sense absent a language. There should be a default provider that is a fallback if there isn't a preset language/voice match.

The resolution order would be:

• If utterance has a language property:
  • If a voice is mapped to the language (eg. es-MX) or its superset (eg. es) in the settings:
    • Use the defined voice
  • If there is no mapped language:
    • Search for a voice that supports the language in the defualt provider
    • If a voice was found:
      • Use it
    • If no voice was found move on to the next provider (in undeterminate order) and search again
• If there is no language property in the utterance, use system locale and do search above.

In addition to a voice ID, each set language should also have a pitch and rate associated with it.