[Swfdec] some patches for swfdec

[Nguyen Thai Ngoc Duy]

Here are some patches I made yesterday. They add three actions:
duplicateClip, removeClip and With, one method Math.abs and bug fixes.
All base off 'as' branch. Please have a look if you are going to apply
them because I'm quite new in swfdec development.

BTW, how can I implement createEmptyMovieClip? I have no idea how to
create an SwfdecMovie properly. I also need to add the following. If
you have any idea, please tell me.

gotoAndPlay
_level0 global variable
swapDepths method
lineTo, lineStyle, moveTo
ahh.. those movies created by duplicateClip do not get added as
properties to _root. I saw blocky.swf trying to access movies via
_root.

some less important ones:

System global variable
Sound object
-- 
Duy
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