Transition Behaviours Extended

[danobot]

This PR implements transition behaviours as to allow some change to the behaviour. Cleans up implemention added in v6.0.0 and extends the number of transition points.

The behaviour implemented with end_time_action and start_time_action has been replaced with a more generic callback to make it the same as the other callbacks.

    behaviours:
      on_enter_constrain: "ignore"
      on_exit_constrain: "ignore"

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Description

Related Issues

Closes #154