Description:Add debug/index.css and TrackAnim
Add UI to switch between BezierAnim and TrackAnim

Issue: NA
Author: Arnaud Joubel <arnaud.joubel@gmail.com>
Review: NA
Test performed:jake debug
Test result: pass
Description: Improve TrackAnim

Issue: NA
Author: Arnaud Joubel <arnaud.joubel@gmail.com>
Review: NA
Test performed:jake debug
Test result: pass