Add player behavior

[NotBad4U]

A player should be able to:

• Move toward a target (any point of the map) Add the steering behaviors seek #1
• Pursuit another player Add steering behaviors: Pursuit and Evade #2
• Evade a pursuer Add steering behaviors: Pursuit and Evade #2
• Move toward a resource Add the steering behaviors seek #1
• Consume a resource
• Knowledge of entities in its area of interest.
• Discover entities in a other system Seamless world game #7
• Wander when he has nothing to do

The player will act only when it's his turn to play. That'll be orchestrate by the Arbitrator.
The player (Cell) should only output one action (not sure to be clear here) when it's his turn e.g.: A player can Move or consume a resource but not do the both in the same turn.
I think that'll make the code more simple and limit the number of message emit.

Explanations

Discover entities close to his area of interest

We can illustrate this with this picture where no entities or close to him so he don't need to know about them but if an entity come close to him he must be informed for that. That work for entities in a neighbor system see #7. Maybe the region actor #4 can do this work.

Discover entities when he in another system

Moving Between Maps need to make a discover of close resources and inform other player that happend.

[NotBad4U]

With the merge of #31 #15 #26 #21 we can close this one