Addon Support

It's been on the Todo list for a while, so I figured I'd take a look at how it could be implemented. I've come up with a quick demonstration addon and extension which allow (in theory, it isn't tested) commands to be sent over a Named Pipe from Articulate and be received within ArmA by a script which compiles and executes these commands.

The only problem I foresee is that some of the functionality currently provided by the command menu cannot easily be replicated by SQF commands (for example, selecting units by their "number"). If you can think of ways around these issues then we should be in business - in the mean time I'll try and get this finished up and tested to make sure it works the way it should, at which point we can start integrating some new features (like target my current target, or get in the vehicle I'm pointing at etc.)

## Not Ready To Merge