/// <summary>
/// Adds a new bool var to the supplied blackboard.
/// Automatically handles undo.
/// <param name="blackboard">The blackboard to add a new BoolVar.</param>
/// <returns>The new variable.</returns>
/// </summary>
public static BoolVar AddBoolVar (InternalBlackboard blackboard) {
BlackboardUtility.RegisterVariableUndo(blackboard, "Add Bool Variable");
var newVariable = blackboard.AddBoolVar();
EditorUtility.SetDirty(blackboard);
return newVariable;
}