Implement support for games vs in-game AI

[vitvakatu]

I think an ability to set up a game bot vs in-game AI fits nicely into the scope of this library and also opens new opportunities for bot testing.

I can implement it myself, if you do not have any objections.

[eladyaniv01]

If you could, that would be great, moreso, any other improvement or new feature would be welcomed

[vitvakatu]

Great. I think it will also allow @UltraMachine to reduce amount of code in Rust SC2 lib, because the client code for communicating with the game will not be duplicated among rust-sc2 and this library, though maybe there are some undiscovered issues here.