UI: Omit stream codecs the service doesn't support

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This change makes it so that if you select a service, it will check to
see what codecs that service supports, and only list encoders of those
codecs.

If the service doesn't support a codec and you currently have an
unsupported codec selected in output settings, then it'll prompt you
with a dialog telling the user it will switch to a supported codec, and
if they click yes, then it'll change the codec for the user. If they
click no, then it'll switch back to the previously selected service.

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