The BackgroundSequence node is suitable for performing background tasks or target transformations.
It executes its children sequentially until one of them returns
`FAILURE`, `RUNNING` or `ERROR`. If all children return success ,
the sequence also returns `SUCCESS`. On every tick, it restarts from child 0.
Put background subtrees first
defines validation methods to execute at the editor; if one of them fails, a dashed red border is displayed for the node