Refactor of capture buffer management between cores.

Instead of copying data into and out of FIFO, passing buffer pointers between cores that are sized to match preferred/ideal SD card write size.

firmware/application/analog_audio_app.hpp

@@ -143,7 +143,7 @@ private:
 
 	RecordView record_view {
 		{ 0 * 8, 2 * 16, 30 * 8, 1 * 16 },
-		"AUD_????", RecordView::FileType::WAV, 12, 2,
+		"AUD_????", RecordView::FileType::WAV, 4096, 4
 	};
 
 	spectrum::WaterfallWidget waterfall;