Changed a model used on the laser cube which was showing up as an "Error" sign for some users.

- Slightly changed layout of first chamber, so the player can not throw the cube on to the button, forcing them to reload the map.
- Added a light in the third chamber so a white surface in more noticeable.
- Moved around explosives so it's easier for the laser to hit the catcher.

Changed layout of one of the chambers due to a glitch which made a wall disappear. Thanks to Mega Unowninator for pointing that out.

Re-added custom skybox texture. This time remembering to pack it in the .bsp.

Removed custom skybox texture becuase it was not packed with the .bsp file. Causing the skybox areas to look like a blurry void.

Fixed a cubemap issue