core: adding right allegro hand

python/example_robot_data/robots_loader.py

robots/allegro_hand_description/meshes/base_link.STL

robots/allegro_hand_description/meshes/base_link_left.STL

robots/allegro_hand_description/meshes/link_0.0.STL

robots/allegro_hand_description/meshes/link_1.0.STL

robots/allegro_hand_description/meshes/link_12.0_left.STL

robots/allegro_hand_description/meshes/link_12.0_right.STL

robots/allegro_hand_description/meshes/link_13.0.STL

robots/allegro_hand_description/meshes/link_14.0.STL

robots/allegro_hand_description/meshes/link_15.0.STL

robots/allegro_hand_description/meshes/link_15.0_tip.STL

robots/allegro_hand_description/meshes/link_2.0.STL

robots/allegro_hand_description/meshes/link_3.0.STL

robots/allegro_hand_description/meshes/link_3.0_tip.STL

robots/allegro_hand_description/meshes/link_4.0.STL

robots/allegro_hand_description/urdf/allegro_hand.urdf