Graphics, "music", minor AI adjustment

Added sprites, tiles, new room with lighting system & lighting scripts.
Includes extremely goofy ass animation.

Rewrote scr_ai_melee using mp_potential_step. Commented out old.

Added turning to face player to enemy.

Deleted enemy HP checking for animation.

Commented out entire Step event in obj_globals, stamina check was
causing a crash.

Returned to event-based arrow key navigation. The WASD movement was
acting really weird...I'm sure we can get WASD to work, just needed to
playtest graphics and arrows were working without debugging.

Added "music"