SimServiceManager enhancements;
SimServiceManager enhancements;

* Using enum for type-safe way of describing event names, e.g. Sim.Event.TimeChanged (similar to the emitted events in the ApiManager, e.g. Api.Event.KeyChanged.
* Added start method to start the sim. Although you can add your own behaviour in the init method, the connectors will not be initialized at that time.
* Added sendAck method to acknowledge the current state. On each time message, an ack is send back. In case all sims are in the state Ready, the simulation can continue.

TNOCS/SimulationService,TNOCS/SimulationService,TNOCS/SimulationService