[DRAFT] Stamped blackboard #805
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This PR introduces a new functionality: a timestamp and unique sequence number added to each entry in the blackboard!
Using the "blackboard" model it is hard to know if a value is "old" or was updated, since the last time it was accessed.
Now, when a blackboard entry is set, its sequence_id is automatically incremented and stamp (anoneseconds since epoch) is automatically updated.
Users can access this information using the methods:
Blackboard:getStamped()TreeNode::getInputStampedIt also introduces two new Decorators to use this functionality:
WaitValueUpdate: will sleep until a new value is set in the blackboard, and execute the child afterward.SkipUnlessUpdated: skip this entire branch, unless a value in hte blackboard is updated.