Make TaskManager global, keep Task hook per GameObject

[Sygmei]

There is no benefit to have one TaskManager per GameObject, it forces every GameObject to listen on Event.Game.Update which is killing performance.

We could just keep one Task hook per GameObject to have proper listener ids.

We could also have a global Task hook to allow librairies to create Tasks.

[Sygmei]

Maybe we don't actually need a global Task hook as it will make global Tasks alive as long as the game is running, instead we might need a way to dynamically attach OrphanTasks (defined in a separate module) to the current GameObject.