Change the ChemLabel border color

Changed the border color of ChemLabel class.
Added a semi-transparent background to the Cycle class.

Added a semi-transparent background to the Cycle class so the hole in
the cycle can be clicked.
Added function in MyFuntion class.

Added function calBrightness to calculate the luma of an input color.
Improved ChemLabel class.

Improve ChemLabel class’s function to scale up when the mouse is over
and scale down when the mouse is out so it works correctly.
Improved CycleGroup class.

Improved CycleGroup class so it passes on the mouse down event to the
activated cycle.
Added function in CycleGroup class.

Added the function to exit from cycle mode and go into cycle group mode
with ‘q’ key.
Impoved CycleGroup visual.

Added tween for the color fade when switching between cycle mode and
cycle group mode.
Changed most class to Sprite.

Changed most class from extending movie clip class to the sprite class
to reduce overhead.