improvement(actors): use the new timers modules

gamecore/modules/world/actors/baseactor.lua

@@ -229,17 +229,16 @@ end
 -- Control the integrated timers of the actor
 
 function BaseActor:initTimers()
-  self.timers = {}
+  self.timers = core.modules.Timers(self)
 end
 
 function BaseActor:addTimer(name, t)
-  self.timers[name] = Timer(self, name, t)
+  core.debug:warning("actor", "function actor:addTimer is deprecated, prefer actor.timers:newTimer")
+  self.timers:newTimer(t, name)
 end
 
 function BaseActor:updateTimers(dt)
-  for k,v in pairs(self.timers) do
-    v:update(dt)
-  end
+  self.timers:update(dt)
 end
 
 function BaseActor:timerResponse(name)