Add support for audio Flash players

Currently, the FlashVideo module supports video only. And it does so quite well, I might add.

Recently, however, I needed to find a solution for audio uploads that were handled in a similar way to FlashVideo. I decided to add support for the two players, button.swf and 1pixelout.swf. I eventually decided to go with another solution (Media Field with some code I wrote for FFMPEG conversion), but thought that this may be useful to somebody.