Migrating from another custom items plugin:

1. Copy the contents of the old plugin's folder into the matching
   subfolder here (e.g. everything inside plugins/Oraxen/ into
   migrations/Oraxen/).
2. Back up your worlds.
3. Run /ecoitems migrate <oraxen|nexo|itemsadder> from the console.
4. Check the console for anything that could not be converted.

Converted configs are written to items/imported/, glyphs/imported/
and sounds/imported/; pack assets are copied into pack/. Nothing in
this folder is ever loaded directly, and running a migration twice
skips files that already exist.