message: zorder to display goal definition on top of lane polygon
diff: @@ -217,13 +217,13 @@ class BaseViewer(Viewer):
  def drawGoalDefinition(self, goal_definition, color, alpha, facecolor):
  if isinstance(goal_definition, GoalDefinitionPolygon):
  self.drawPolygon2d(goal_definition.goal_shape,
  - color, alpha, facecolor, zorder=0)
  + color, alpha, facecolor, zorder=2)
  elif isinstance(goal_definition, GoalDefinitionStateLimits):
  self.drawPolygon2d(goal_definition.xy_limits,
  - color, alpha, facecolor, zorder=0)
  + color, alpha, facecolor, zorder=2)
  elif isinstance(goal_definition, GoalDefinitionStateLimitsFrenet):
  self.drawPolygon2d(goal_definition.goal_shape,
  - color, alpha, facecolor, zorder=0)
  + color, alpha, facecolor, zorder=2)
  elif isinstance(goal_definition, GoalDefinitionSequential):
  prev_center = np.array([])
  for idx, goal_def in enumerate(goal_definition.sequential_goals):
  