nav2_way_point_follower; introduce photo at waypoint arrivals plugin (ros-navigation#2041)

* nav2_way_point_follower; introduce photo at waypoint arrivals plugin

Signed-off-by: jediofgever <[email protected]>

* resolve cmake lint errors

Signed-off-by: jediofgever <[email protected]>

* resolve requested chages of first review

Signed-off-by: jediofgever <[email protected]>

* minor corrections on photo_at_waypoint header

* resolve requested changes of second review

Signed-off-by: jediofgever <[email protected]>

* update default save_dir

Signed-off-by: jediofgever <[email protected]>

* move directory checking code to initialize()

Author: jediofgever

nav2_bringup/bringup/params/nav2_params.yaml

@@ -289,8 +289,8 @@ waypoint_follower:
   ros__parameters:
     loop_rate: 20
     stop_on_failure: false
-    waypoint_task_executor_plugin: "waypoint_task_executor"   
-    waypoint_task_executor:
+    waypoint_task_executor_plugin: "wait_at_waypoint"   
+    wait_at_waypoint:
       plugin: "nav2_waypoint_follower::WaitAtWaypoint"
       enabled: True
-      waypoint_pause_duration: 0
+      waypoint_pause_duration: 200