Tech/LxEngine/Tutorials/Tutorial 5

Tutorial 5 is a work-in-progress.

Current goals for the tutorial may include:
 * A large landscape model
 * A first-person camera and "player" with basic physics to move around the landscape
 * A custom sky shader
 * A console to view messages and type commands
 * A splash screen
 * Full-screen fade-in / fade-out effects on load and shutdown

Fade-in. A app global for fade-level. If non-zero, add a final pass to overlay a black+alpha quad on top of the render. Use a timed-event to gradually fade the value in.