Make the Permanent Items tab for loot generation be separated into different categories

[Fyrexian]

Is your feature request related to a problem? Please describe.
It's kind of annoying when I want to generate loot for specifically for an armor-smith, but get weapons and other items non-related to it. Right now the only option is "Data Sources"

Describe the solution you'd like
Have different loot categories to generate from,
I.E a "weapons" category, a "armor" category ext.