Added "StructurePlacementOverride"
- Allows changing structure placement rate (Villages, Ships, Igloo...)
For example:
Code (Text):
StructurePlacementOverride override = new StructurePlacementOverride();
override.setStructurePlacement(StructurePlacementOverride.StructurePlacementType.IGLOO, 4, 2);
advancedworldcreator.setStructurePlacementOverride(override);