remove some includes as well as add missing functions

dsp/bs412.c

@@ -5,7 +5,8 @@ float dbr_to_deviation(float dbr) {
 }
 
 float deviation_to_dbr(float deviation) {
-	return 10 * log10f((deviation + 1e-6f) / 19000.0f);
+	if(deviation == 0.0f) return -100.0f;
+	return 10 * log10f(deviation / 19000.0f);
 }
 
 void init_modulation_power_measure(MPXPowerMeasurement* mpx, int sample_rate) {

dsp/bs412.h

@@ -1,6 +1,8 @@
 #pragma once
 #include <math.h>
+#ifdef BS412_DEBUG
 #include "../lib/debug.h"
+#endif
 
 typedef struct
 {

dsp/filters.h

@@ -1,11 +1,7 @@
 #pragma once
 
-#include <string.h>
-#include <stdlib.h>
 #include <math.h>
-#include "constants.h"
 #include "../lib/optimization.h"
-#include "oscillator.h"
 
 typedef struct
 {