use groundtruth pose in sim

control more realistic based on pose estimation

debug drone sim expert

debug ros integrated, timing issues.

fetched changes upstream

added lidar to drone

update to singularity image

hector_quadrotor_controller_gazebo: fix API compatibility for Gazebo version 8 and above

hector_quadrotor_interface: use shared_ptr typedefs for urdf types

hector_quadrotor_gazebo_plugins: switch dependency from specific Gazebo version to generic gazebo_dev

update: change quadcopter

update: changed hector quadrotor gazebo urdf file with .in

Merge branch 'master' of https://github.com/kkelchte/hector_quadrotor

update

add turtle