0.18.2-dev

Fix a bug with chunks being overwritten

- When a player presses "escape" button quickly after loading the world,
  when all chunks hasn't loaded yet, a world save is triggered.
  The issue is, the dummy chunks are also saved, thus, overwriting the
  actual chunks that are yet to be loaded.
  Fix this by preventing a dummy chunk from being saved to the disk.
- Remove unused file - ui/config.go