Rename schunk arm topic with use of namespace

Renamed these topics within three repositories:
* /schunk/target_vc/joint_states -> /schunk/move_all_velocity
* /schunk/target_pc/joint_states -> /schunk/move_all_position
* /schunk/position/joint_states -> /joint_states
* /schunk/position/pre_mimic/joint_states -> /schunk/pre_mimic_joint_states
* /schunk/trajectory/command -> /schunk/trajectory_command
* /schunk/trajectory/state -> /schunk/trajectory_state
Rename schunk related topics within three repositories

Renamed topics to underscore, replacing 'target' with 'set'.
Changed type of dummy messages from type Bool to Empty.
Adjust for movement of messages into separate package metralabs_msgs
Merge branch 'master' of git://github.com/felix-kolbe/uuisrc-ros-pkg