Added option to prevent corner cutting by setting the pruning distance of waypoints

Added params to enable the local planner to select the first valid waypoint within a given distance threshold

prune_waypoints : true enables this behavior
waypoint_prune_distance: pruning_distance (default 0.4) dictates the waypoint distance

Note that setting a very small value (e.g. 0.1) can lead to the robot moving slower because the valid trajectories that get close to the selected waypoint will be at slow velocities.
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