major simulator rework:

- wait for first message from jMAVSim
  before sending data
- publish raw rc data coming from PIXHAWK (temporary)
- send some interesting messages to jMAVSim
- prepare sensor data for sim drivers to read

src/modules/simulator/simulator.cpp

@@ -71,11 +71,32 @@ bool Simulator::getRawAccelReport(uint8_t *buf, int len)
 	return _accel.copyData(buf, len);
 }
 
+bool Simulator::getMagReport(uint8_t *buf, int len)
+{
+	return _mag.copyData(buf, len);
+}
+
 bool Simulator::getBaroSample(uint8_t *buf, int len)
 {
 	return _baro.copyData(buf, len);
 }
 
+void Simulator::write_MPU_data(void *buf) {
+	_mpu.writeData(buf);
+}
+
+void Simulator::write_accel_data(void *buf) {
+	_accel.writeData(buf);
+}
+
+void Simulator::write_mag_data(void *buf) {
+	_mag.writeData(buf);
+}
+
+void Simulator::write_baro_data(void *buf) {
+	_baro.writeData(buf);
+}
+
 int Simulator::start(int argc, char *argv[])
 {
 	int ret = 0;