Rebuilt cubemap; set tint colour for globe (RGB 0, 162, 255)

Now with information panel and location overview globe.

Multiplayer update:

* enabled shadows for directional light, and world materials set to receive shadows - player avatars and spawned physics objects will now look more part of the world
* simplified physics mesh for world - improving perf and decreasing download size

Created Concrete Ruins at Harborough Rocks, Derbyshire, UK.