Updated images

Stats, Awards, Credits have banner behind text for better contrast.
Swapped colors of Stats and Credits buttons. Fixed drop-shadow on
Craft, Store, and Play screens. "Game Over" screen now has two button
images (see updated doc). "Results" screen now has button images (see
updated doc). Added "Continue" for Tutorials (see Tutorials Screen UI
doc). Added "Day" screen. Added "ewero" particle.