Introduction of virtual actor

[NotBad4U]

A virtual actor will be use has a proxy to manage the interaction across region to allow players to interact with game objects across region map boundaries. This actor will fake a player in a other region and when a player interact with him, he'll proxy the message to the real actor placed in a neighbor ActorSystem.

We should take a look at : Akka reliable-proxy

TODO

• Proxy the message
• Keep up to date with the position (x, y) of the real actor on the map

[NotBad4U]

with the merge of #31 maybe we can close this one @d-plaindoux ?

[d-plaindoux]

Yes.