Add the sub project.
Use NCommander.
Flip coordinates if they're out of order.
Add the World and BlockType parameter types. Add the fill and clear commands.
Fix typo.
Use lower-case names.
Compact the list of block types. Also show numbers.
Add the set_data, replace, sphere, and torch_grid commands.
Use the optional 'data' param, if set.
Automatically grab all block types.