I restructured the content and added new assets

The files are now structured better and not that cluttered anymore. What I did in this update:

• Add new content! Especially housing items are now available abundabtly, but all categories got new assets.
• All assets are now structured into these categories: Housing, Fortified structured, Misc items, Nature, and Paths and Places.
• The content is now aligned in a proper grid per file and not thrown around everywhere.
• A bit of graphics cleanup.

Stay tuned for more!