Rename Simulator class private methods names to match snake case of other private class methods.

src/modules/simulator/simulator.h

@@ -272,7 +272,7 @@ private:
 	}
 
 	// class methods
-	void initializeSensorData();
+	void initialize_sensor_data();
 
 	int publish_sensor_topics(mavlink_hil_sensor_t *imu);
 	int publish_flow_topic(mavlink_hil_optical_flow_t *flow);
@@ -338,7 +338,7 @@ private:
 
 	void parameters_update(bool force);
 	void poll_topics();
-	void pollForMAVLinkMessages(bool publish);
+	void poll_for_MAVLink_messages(bool publish);
 	void request_hil_state_quaternion();
 	void send();
 	void send_controls();