[crossfire] Moving faceset info from socket to common

[Mark Wedel]

Nicolas Weeger wrote:
> Hello.
> 
> Currently, the read_client_images() function, and supporting variables 
> (everything related to faceset, including the actual png pictures), are 
> located in the socket library.
> 
> I'd like to move this to common (in trunk), for 2 reasons:
> 1) it isn't related to sockets, except because it's sent to the client
> 2) for my mapper tool, I need the actual face. But linking to libsocket causes 
> many issues, many undefined functions. So any program wishing to use actual 
> faces will have a hard time to do this :)

  I don't have any objections.