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WIP: Modify velocity sign on HA* path by forward/backward motion

Implemented feature

!48 (closed) has been replaced by this MR due to the change of the person in charge.

Add AstarWaypoints definition to astar_search in include motion direction, "forward or backward" provided by HA* path planning. astar_navi and astar_avoid are modified by this API to realize backward motion.

Related to #8 (closed)

Description

If the use_back option is enabled in astar_navi/avoid, you can obtain avoidance waypoints with "signed" velocity like this. Screenshot_from_2019-10-01_19-55-54

Edited by Yuma Nihei

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