SITL: move all models to unified rcS startup and remove old scripts

ROMFS/px4fmu_common/init.d-posix/1010_iris_opt_flow

ROMFS/px4fmu_common/init.d-posix/1010_iris_opt_flow.post

ROMFS/px4fmu_common/init.d-posix/1011_iris_irlock

ROMFS/px4fmu_common/init.d-posix/1012_iris_rplidar

ROMFS/px4fmu_common/init.d-posix/1013_iris_vision

ROMFS/px4fmu_common/init.d-posix/1014_solo

ROMFS/px4fmu_common/init.d-posix/1020_hippocampus

ROMFS/px4fmu_common/init.d-posix/1030_plane

ROMFS/px4fmu_common/init.d-posix/1040_standard_vtol

ROMFS/px4fmu_common/init.d-posix/1041_tailsitter

ROMFS/px4fmu_common/init.d-posix/1042_tiltrotor

ROMFS/px4fmu_common/init.d-posix/1060_rover

ROMFS/px4fmu_common/init.d-posix/rcS

ROMFS/px4fmu_common/init.d/rc.fw_apps

ROMFS/px4fmu_common/init.d/rc.vtol_apps

ROMFS/px4fmu_common/init.d/rcS

Tools/sitl_run.sh

launch/iris_env.sh

launch/mavros_posix_sitl.launch

launch/multi_uav_mavros_sitl.launch