Added todo list.
Added setSimulationSpeed method to Model.

Renamed some of Model fields to has _ at the end as they are private.
Added simspeed control slider to UI and its handlers.
Added new Event type (EventSetSimulationSpeed).
Added handling of new event type to Controller.
Added method of handling setSimulationSpeed in Qt->OOP bridge.
Added new event type include to AllEvent header.
Added new event type to buildsystem.