modules/world: init fake keys for every actor

Only the "player object" will get the real inputs

gamecore/modules/world/actors/actor2D.lua

@@ -8,9 +8,14 @@ function Actor2D:new(world, type, x, y, w, h)
   self.h      = h or 0
   self.type   = type or ""
 
+  self:initKeys()
   self:register()
 end
 
+function Actor2D:initKeys()
+  self.keys = core.input.fakekeys
+end
+
 function Actor2D:register()
   self.world:registerActor(self)
 end