Iris: Add custom startup script

posix-configs/SITL/init/rcS_gazebo_iris_opt_flow

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+uorb start
+simulator start -s
+param load
+param set MAV_TYPE 2
+param set MC_PITCHRATE_P 0.3
+param set MC_ROLLRATE_P 0.3
+param set MC_YAW_P 2.0
+param set MC_YAWRATE_P 0.35
+param set SYS_AUTOSTART 4010
+param set SYS_RESTART_TYPE 2
+dataman start
+param set CAL_GYRO0_ID 2293768
+param set CAL_ACC0_ID 1376264
+param set CAL_ACC1_ID 1310728
+param set CAL_MAG0_ID 196616
+param set CAL_GYRO0_XOFF 0.01
+param set CAL_ACC0_XOFF 0.01
+param set CAL_ACC0_YOFF -0.01
+param set CAL_ACC0_ZOFF 0.01
+param set CAL_ACC0_XSCALE 1.01
+param set CAL_ACC0_YSCALE 1.01
+param set CAL_ACC0_ZSCALE 1.01
+param set CAL_ACC1_XOFF 0.01
+param set CAL_MAG0_XOFF 0.01
+param set MPC_XY_P 0.15
+param set MPC_XY_VEL_P 0.05
+param set MPC_XY_VEL_D 0.005
+param set MPC_XY_FF 0.1
+param set SENS_BOARD_ROT 8
+param set COM_RC_IN_MODE 1
+param set NAV_ACC_RAD 2.0
+param set RTL_RETURN_ALT 30.0
+param set RTL_DESCEND_ALT 10.0
+rgbledsim start
+tone_alarm start
+gyrosim start
+accelsim start
+barosim start
+adcsim start
+gpssim start
+pwm_out_sim mode_pwm
+sleep 1
+sensors start
+commander start
+land_detector start multicopter
+navigator start
+attitude_estimator_q start
+position_estimator_inav start
+mc_pos_control start
+mc_att_control start
+mixer load /dev/pwm_output0 ../../../../ROMFS/px4fmu_common/mixers/quad_w.main.mix
+mavlink start -u 14556 -r 2000000
+mavlink start -u 14557 -r 2000000 -m onboard -o 14540
+mavlink stream -r 80 -s POSITION_TARGET_LOCAL_NED -u 14556
+mavlink stream -r 80 -s LOCAL_POSITION_NED -u 14556
+mavlink stream -r 80 -s GLOBAL_POSITION_INT -u 14556
+mavlink stream -r 80 -s ATTITUDE -u 14556
+mavlink stream -r 80 -s ATTITUDE_TARGET -u 14556
+mavlink stream -r 20 -s RC_CHANNELS -u 14556
+mavlink stream -r 250 -s HIGHRES_IMU -u 14556
+mavlink stream -r 10 -s OPTICAL_FLOW_RAD -u 14556
+mavlink boot_complete
+sdlog2 start -r 100 -e -t -a