Introduces talos_gazebo with flexibilities.

CMakeLists.txt

config/collision_parameters.yaml

config/default_configuration_hanging.yaml

config/default_configuration_locomotion.yaml

config/default_configuration_zeros.yaml

config/rviz.rviz

config/talos_plotjuggler.xml

launch/talos_gazebo.launch

launch/talos_spawn.launch

package.xml

robots/talos_full_no_grippers.urdf.xacro

robots/talos_full_v1.urdf.xacro

robots/talos_full_v2.urdf.xacro

robots/talos_lower_body.urdf.xacro

robots/upload.launch

robots/upload_talos.launch

src/SpringPlugin.cc

src/SpringPlugin.hh

urdf/arm/arm_v1.urdf.xacro

urdf/arm/arm_v2.urdf.xacro