This update includes minor fixes and changes in preparation for the physical release:

- fixed  issues with the train length not colliding correctly with some objects

- Added train horn noise, pressing B will toot the train horn. each train has a unique sound.

- Increase the blink/hurt timer for the player train to about 3 seconds instead of 1 

- matched typeface(font) of text for title, menu, and game over screen.

- added background image for game over screen.