UI: Add low latency audio buffering mode to UI

This feature is meant to reduce maximum audio buffering and turn off
dynamic buffering mode. This allows the lowest possible consistent
latency for audio buffering, which is useful for the decklink and NDI
outputs which cannot rely on audio timestamps for synchronization.

This can have a negative effect of making audio segments (partial or in
full) cut out. So audio glitching or audio loss can occur if this is
enabled.
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f