added inputexp tracking to model, sync event handling, and syncmode tracking
added inputexp tracking to model, sync event handling, and syncmode tracking

UIKit0/sketch-n-sketch,ravichugh/sketch-n-sketch,silky/sketch-n-sketch,silky/sketch-n-sketch,ravichugh/sketch-n-sketch,ravichugh/sketch-n-sketch,florence/sketch-n-sketch,UIKit0/sketch-n-sketch,ravichugh/sketch-n-sketch,silky/sketch-n-sketch,florence/sketch-n-sketch,UIKit0/sketch-n-sketch,ravichugh/sketch-n-sketch,ravichugh/sketch-n-sketch,florence/sketch-n-sketch