Forage and archive Zones

[jdrueckert]

As discussed in #1, Zones broke a while ago and is not worth reviving due to design/implementation flaws.

We can have a quick look through its assets and code, forage what we deem worthy to keep and then archive it into https://github.com/Terasology-Archived.
The module is not part of the omega line-up, so no additional actions are necessary.

Assets to forage:

• open book texture
  • this seems to already have been copied into the engine assets, however in a weird aspect ratio.
• zone icons
  • some of these icons have already been copied into the engine assets
  • book icons can be moved into the Books module

Code to forage:
I didn't see any code worth keeping.