Improvements in Behavior Tree specification.

[rdinizcal]

1. Fixed lane_change_tree_scenario.btree behavior tree.
2. Added optional name to coordination nodes. See drive_tree.btree for an example.

Obs. if one does not provide a name to a coordination name, it will atuomatically generate one as it was done before.

[rdinizcal]

New added features:

• Use modifier for every tree,
• Use modifier for every leaf,
• Use modifier more than one modifier,
• Propagate modifier to subtrees.

The modifiers can be hardcoded in the BehaviorModels.py through the reconfigure_nodes method. Please take a look at the class itself to have a good idea of how it works.

The current version does not enable individual parameters reconfiguration. This demands further changes.