Stand clear, doors closing...

• The scale change actually broke all of the door code. Got this happening again, fixing several bugs along the way
• Door, decals, lights and switches can be linked together. So toggling a switch can change an actor's model, trigger events, etc. For example, the terminal in the screenshot changes the decals on the floor, the tick/cross light, changes the light from red to green, plays a sound and opens the door...then does the opposite when the switch is toggled again.
• Added a fudge factor to the shadowing code. This fixed a lot of issues with the shadows.
• Changed the level select screen to be a list of levels, rather than the 3D island map. The island map is much nicer, but would take a fair bit of effort to change, make look good, etc.
• Many under-the-hood and editor improvements.