Added helper methods to MessageDispatcher

I was using the message dispatcher and I found having methods like these quite useful.

If they fall outside of the scope of the object please ignore
Yeah I agree, parameters with different order in overloaded methods are rather ugly.
But this would be the first API change of the snapshot. Since it's not a crucial change I'd prefer to make single int methods deprecated for now. Then, as soon as other API changes will come out we can get rid of them.