CONTROL Descriptor Support

Hi,

I added CONTROL Descriptor support. I'm not sure why a bunch of files I didn't touch came up as minor changes, though. I'm thinking it was a VS2010 / AStyle thing.

Also, I noticed previous versions of avdecc-lib automatically enumerated descriptors, is that no longer the case? Unless we're doing something wrong, the latest code I grabbed doesn't seem to do that.

Cheers,

John