minor trigger refactoring

firmware/controllers/math/engine_math.cpp

@@ -411,7 +411,7 @@ void prepareOutputSignals() {
 	}
 #endif /* EFI_UNIT_TEST */
 
-	engine->triggerCentral.triggerShape.prepareShape(engine->triggerCentral.triggerFormDetails);
+	engine->triggerCentral.prepareTriggerShape();
 
 	// Fuel schedule may now be completely wrong, force a reset
 	engine->injectionEvents.invalidate();

firmware/controllers/trigger/decoders/trigger_structure.h

@@ -59,7 +59,6 @@ public:
 	void setAngle(angle_t angle);
 };
 
-class Engine;
 class TriggerDecoderBase;
 class TriggerFormDetails;
 class TriggerConfiguration;

firmware/controllers/trigger/trigger_central.h

@@ -54,6 +54,10 @@ public:
 	void validateCamVvtCounters();
 	void updateWaveform();
 
+	void prepareTriggerShape() {
+		triggerShape.prepareShape(triggerFormDetails);
+	}
+
 	// this is useful at least for real hardware integration testing - maybe a proper solution would be to simply
 	// GND input pins instead of leaving them floating
 	bool hwTriggerInputEnabled = true;