Dimensional coords doesnt work anymore

you were able to do #goto to let baritone convert overworld coords into nether coords eg. This doesnt work anymore...

And I cant find where I could add the code I already made for the pull request.

## how to reproduce
for mc 1.12 and use the newest build that contains the new command system

## Final checklist
- [x] I have included the version of Minecraft I'm running, baritone's version and forge mods (if used).
- [x] I have not used any OwO's or UwU's in this issue.

Reproduce this with Minecraft 1.12 and the newest build containing the new command system. Start by tracing the #goto command and its dimensional-coordinate handling; done means #goto again converts Overworld coordinates into Nether coordinates.

Written by the indexing model from the issue text.