now have a human/sys async interface
the gm/bl is now externalised and can be modified live
but still no other component of the engine have been made

because hss only handle UI
inter service communication is simply not handled
it work for one service one system
but distributed system need to talk

arkanoid
  services:
    ball	is moving, emit its position
    box         limit the game listen to the ball, emit bounce
    brik        give collision detection, self modify same as box 
    plateau     give collision detection, change by user, same as box
  all service should emit to UI
  plateau listen to UI
  all other service listen to ball
  ball listen to all other service 
collision hub can be a good thing
   with be dual port PUBSUB it will be async
   request reply wont be good because it expect one reply for every send
   push pull imply i dont want to notify every one
   pair is just no good