Improve the features of IllustrationPreference.

- Support the dynamic color.
  The colors of the illustration's labels can be changed.
  We create a mapping table of colors and labels.
  According to this mapping table, preference can
  apply the corresponding colors to the illustration.
- Support the middle ground view.
  User can overlay a view on top of the illustration.
- Support the auto scale of illustration.
- Update the layout to prevent the animation cropping.

Fix: 189199177
Test: rebotest and see the UI.
Change-Id: Ib02cbc5bb99ab8014d7ee7ed630a6721968a49ab