Updates to atmosphere and sounds, added events

The procedural generation is now modifiable to allow for the creation of different level types for level-0. Aim to add some height changes to make something similar to pitfalls. However, this may take a bit longer.

Lighting has been updated - still some tweaks needed here.

Volumetric fog has been added.

Issue with occlusion resolved.

Added some scripted events which add to either atmosphere, ambience or confusion.