Remove unused controller code
Add sound effects

Added sound effects for picking up a delivery, dropping off a delivery,
crashing, and missing a delivery.  Created sound effects with sfxr.

I committed the .sfs files because that will allow me to make minor changes
to the the sound effects in sfxr, and then I can revert if I don't like the
changes.  However, those files are binary.
Add travel time estimation to the Courier

Add a function for estimating travel time to a given location to the
Courier class.  Use this function in DeliveryLocation when a dropoff
location is created to set the timer accordingly.  This function is
not used for the pickup locations.  Those are still timed at 10 seconds
for now.
Add delay after crash and add gameOverLoop

Add a delay between the player crashing and being shown the game over
screen.  Also create a separate gameOverLoop.