Unity3d - Doom Clone project - grayboxed level

Another update for "Doom Clone in Unity 3d" project.

Changes:

• Grayboxed the level.
• I've automated creation of sprites for the game.
• Added glow effect on enemies. "Lit up" parts will no longer fade out into darkness.
• Lots of tweaks in the level editor - level can now be split into multiple moving parts upon baking, meaning it should be now possible to create moving ceilings/floors/etc.

There's still a lot of stuff to do. The prototype needs tweaking in walking speed, sound effects, textures, etc, etc, etc.