Using the Events

Runner to be disabled before the first game is started =deactivate its
renderer and the runner component itself.
-witch its rigidbody to kinematic mode to freeze it in place
-Now Runner reacts properly to the game events, but once the first
platform has been recycled all new games will be over rather quickly,
as Runner immediately plummets. Let's modify our platform manager so it
reacts to the events as well
-give SkylineManager the exact same treatment, so all parts of the game
respond nicely to our events.