Alter main loop flow
Adapt Level.step to the new main loop flow
Alter the Ender base class to fit the new flow of Level.step
Fix indentation error in Game.run
Modify DumbEnder to fit the new Ender interface
Fix Behaviour.prepare's arguments
Introduce a fixed dynamics timestep to the main loop
Fix style issue
Decouple time measurement and input
Intermediate changes
See that redrawing of dead Entities doesn't work properly
Fix issues with the internal State field set
Make the set of Entities that died last step the initial value of the set of entities to be redrawn
Rename locals in Stage.render (redraw -> dirty)
Lame pun
Shorten the life of the dying Entity
Uncomment the addition of the green box
Make Stage a publisher
Remove Stage.render
Define DrawingStrategy and the dumbest implementation possible