[osflash] 8-bit PNGEncoder

[iiley]

http://demo.aswing.org/AsPngEncoderTest.air
(need newest AIR runtime)

I'v done the 8-bit indexed color encoder, include uniform and median cut
way, the median cut arithmetic speed is optimized from first implementation
16s to now about 1s for a 800*600 image. (And the opaque true color encoding
is really opaque 24-bit true color, different from adobe implementation of a
32-bit simulated opaque get a little big file size)

Later i'll try to open source it if there's some one think it is useful. :)

-- 
iiley
AsWing http://www.aswing.org
Personal http://www.iiley.com
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