New builtin nodes for stamped values missing

[kdhansen]

Describe the bug
With the BehaviorTree.CPP release 4.6, three new builtin nodes is available, but they are not present in the Groot2 Models list:

• SkipUnlessUpdated
• WaitValueUpdate
• WasEntryUpdated

To Reproduce

1. Open Groot2
2. Look in the Models list

Expected behavior
I would expect the above nodes to be present in the Models list

Screenshots and videos

Desktop (please complete the following information):

• OS: Ubuntu 20.04
• Groot2 version 1.6.0

[facontidavide]

I will fix it soon (probably version 1.7.2)