Added score related textures.
Draw Score on Game Over screen.
Made draw_number handle negative numbers.
Refactored to prepare_new_game.
Added tracking of number of torpedos fired.
Added tracking of number of monsters killed.
Moved around function, because C.
Display the actual calculated score on the game over screen.
Draw number of monsters killed on game over screen.
Draw numbers of torpedos fired on game over screen.
Moved up Score printing.
Draw Level on game over screen.