Infinite World and Build System Improvements

This took a minute, but this will mark a pretty significant expansion to game functionality, including infinite terrain generation as you explore the world. The barrier walls are down, and you're free to explore! The build system has also been improved, and is now snapped to a 4m increment world grid, for convenient alignment of rooms and wall elements. This system will also fit in nicely with the random POI and dungeon generation that will be added in the near future.

Version 0.7.21.0 - Patch Notes:

• Removed barrier walls, and added infinite terrain generation for limitless exploration
  
• Build mode has been improved and aligned to a 4m world grid
  
• New building parts have been added
  
• Weather and lighting effects have been improved
  
• Saving and Loading of structure elements is now functional (saving of world elements will be added very soon)