Replay buffer and recording should be separate in case the user wants to
start recording from a specific point rather being forced to reconfigure
for regular recording.
Creates a new button on the main window below the recording button for
turning on/off the replay buffer.
If the user hits the "stop stream" button it'll transition in to
"stopping stream..." and will continue to output until the stream
reaches the timing in which "stop" was pressed.
However, if there is significant congestion, stopping the stream can
take far longer than the user may like. So there needs to be an option
to forcibly stop the stream in that case; pushing the "stop" button a
second time should allow the user to tell the stream/recording to stop
right away instead of waiting for the precise stop timing.
