Added a flashlight that can be enabled/disabled with the TAB key.

Added a new visual style to play with the flashlight called Perfect Dark. It only uses the lighting available around you so most things are pitch black. I was testing and realized that I liked it so much I should just patch it in now.

Doors now have lights based on their current status. If a door is locked it will be a visible red while unlocked has a green light. Later a door that you have gone through will have a different color making backtracking much easier.