Added api to specify a playing range inside an animation

Added api to specify a playing range inside an animation

The user can now specify a range inside the animation so
when the animation play it will only play inside that range.

E.g

//Set play range between 0.2 and 0.8 progress
animation.SetPlayRange( Vector2( 0.2f, 0.8f ) );

//Animation will begin playing at progress 0.2 and will end at 0.8
animation.Play();

[Problem]  N/A
[Cause]    N/A
[Solution] N/A

Change-Id: I2677b8974fef1c4703c18b2b49f9d6a9f5f06047