Pre-Request Checklist

• I have checked that I am on the latest version of Terra.
• I have searched github for similar features requests, including closed
  ones, and found none.
• I believe this is within the scope of Terra.
• This feature request is for all of Terra, and isn't something that
  should be implemented by a pack or addon.

Feature Description

Adding support for ItemsAdder ores into Terra Worlds

What Problem Does This Solve?

When I try to add custom ores into my world using terra generator/world, It realy annoys me that I have to either manually place the ores or have to use world edit to add the ores and even those solutions aren't that great/work well.

A Solution You'd Like

Being able to add itemsadder:<ore_name> to the world files so the ores would be automatically generated there like on other inferior generators

Alternative Solutions

1. Manually replacing, takes too much time and isn't efficient for an entire world
2. Using world edit to replaceall, to resource heavy and doesn't even work well/work at all sometimes

Additonal Context

This is something that would be added by an addon and not included within Terra itself.