Saving the state

This commit is really just saving what I did in one place to move it to another place
Further implementing the RessourceManager

This class is now acting as the global pool of ressources available in the economy. When the simulation is started, it expects an arbitrary number of ressources to be added to the dicitionary and everyone can ask it for the ID or the name of the ressource
Adding name request to the ressource manager

This will enable querying for a name of a ressource given by ID