Adds warning for lava below

Granted, I've no idea why people blindly jump into strange places that overwrote the stairways, without any way of getting back up, but since they just keep doing it, I went ahead and added a safety check.
Fix display, inform player of offline turrets, list non-hardcoded fuels
Warn about offline turret system after configuration
Merge remote-tracking branches 'origin/pr/10568' and 'origin/pr/10572'

* origin/pr/10568:
  Adds warning for lava below

* origin/pr/10572:
  Warn about offline turret system after configuration
  Fix display, inform player of offline turrets, list non-hardcoded fuels