lrmate200ic: clarify notation used in supported variant list.
lrmate200ic5f: add MoveIt IKFast plugin. Fix ros-industrial/fanuc#130.

This is an old-style IKFast plugin, functionality-wise identical to the others in
the LR Mate 200iC MoveIt plugins package. This does not include the recently merged
ik-search optimisations in moveit_ikfast.