The eventual goal is to add:
1. Support for mapping block, etc. names (minecraft:stone, etc.)
2. Proper support for entities in WorldEdit
3. Support for querying for metadata about a block, entity, etc.
4. Extent support to biomes, structures, and so on
This breaks backwards compatibility for all getWorld() methods, but
shim methods were added for binary compatibility with method calls that
use LocalWorld.