[robots] Introduced the z1 robot

python/example_robot_data/robots_loader.py

robots/z1_description/README.md

robots/z1_description/meshes/collision/z1_GripperMover.STL

robots/z1_description/meshes/collision/z1_GripperStator.STL

robots/z1_description/meshes/collision/z1_Link00.STL

robots/z1_description/meshes/collision/z1_Link01.STL

robots/z1_description/meshes/collision/z1_Link02.STL

robots/z1_description/meshes/collision/z1_Link03.STL

robots/z1_description/meshes/collision/z1_Link04.STL

robots/z1_description/meshes/collision/z1_Link05.STL

robots/z1_description/meshes/collision/z1_Link06.STL

robots/z1_description/meshes/visual/z1_GripperMover.dae

robots/z1_description/meshes/visual/z1_GripperStator.dae

robots/z1_description/meshes/visual/z1_Link00.dae

robots/z1_description/meshes/visual/z1_Link01.dae

robots/z1_description/meshes/visual/z1_Link02.dae

robots/z1_description/meshes/visual/z1_Link03.dae

robots/z1_description/meshes/visual/z1_Link04.dae

robots/z1_description/meshes/visual/z1_Link05.dae

robots/z1_description/meshes/visual/z1_Link06.dae