UI: Add setting for Twitch chat add-ons choice

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Both BTTV and FFZ are fairly popular however they do occasionally
interfere.  To give users the option to chose whichever one they like
most we add a new setting that allows BTTV, FFZ, both, or neither.

Defaults to "None" for new users.  Existing users will be migrated to
"Both" as that's the previous behavior.

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