added a reference to RoundState to the related event args
fixed build error
moved game object adder methods into round state so that they're easier to track
added an event for when all bricks are destroyed
Merge branch 'more-game-logic'
added support for bricks with multiple lives, with rendering

closes #46
Merge branch 'more-game-logic'
Make disk file structure mirror Xcode project structure
Bricks and walls can move on a circular, fixed-height path
Partial-arc circular trajectories for ping-pong walls
Prototype laser mode for ball rendering
Exit walls should kill balls; create floor exit, disabled by default but toggleable on
Merge branch 'master' into config-and-serialization