Death delay

This PR adds a two second delay to respawn and shows a message to indicate to the user that they are respawning (technical gaming term for initialising the "next life").

However, sprites do not seem to be scaling properly on my screen. Sprites look pixellated when they aren't supposed to.
Could you check this by looking at the number of lives left vs. number of starting lives? Introduce a new global variable only if you absolutely need to.