[FR] "Blueprint Collection" Concept

[vred1]

Is your feature request related to a problem? Please describe.
I wanted to use AJ for my datapack, but I don't want to export each blueprint and then merge the resource packs and datapacks every single time.

Describe the solution you'd like
So, I'd introduce the concept of "Blueprint collections". Basically a "blueprint collection" holds multiple blueprints in the same pack, while keeping the same general settings (eg. Minecraft version, export folder etc.; but you can edit them for each model if you don't like it). Would be very helpful, ngl

[SnaveSutit]

I've implemented an "export all" button that exports all open Blueprints as a temporary solution to this issue in v1.8.0.

I'll probably implement a much nicer version using collections later.