Fix definition parsing in procedural items

[tal5]

Changes

• Fixes the definitions from the definitions: key not parsing properly when used in the procedural items section

Notes

• Might be a good idea to parse them once and store in a map? let me know if that should be done

[mcmonkey4eva]

Preparsing isn't necessarily valid as there can be eg stone[display=<util.random_uuid>] or whatever