Add ability to play a section in a MovieClip

Now, Movieclip only allow play and loop all frames. I have add ability to play only a section in the Movieclip. You can use play( startFrame, sectionLength) to play a section within the movieclip. 

If you have a animation with different state, you can use only one Moveclip to represent all states. So, no need to use different move clip for different state. Best if you have a character with different animation.