Default navigation

[rexim]

• Blocked by Enable the users to handle input #6

simulate entry point from Gloss provides a default navigation. We have to have something like that.

I don't really want to implement it as it's done in Gloss. In Gloss it looks like simulate and play are implemented separately. I want our simulate to be implemented in terms of play with some default event handlers that provide the navigation abilities. Furthermore I want those navigation handlers to be available to the user so they can wrap around them if they need to extend the navigation behaviour.