Global Shell Script (Initial Stages) + more!

As with how I've been doing the last few updates, I make a some of the changes from the few previous updates since the last version release, so you can go to each commit about these topics specifically to get more info about what changed, and to see discussion about the process along the way too. I think trying to summarize it again just when I publish it isn't worth it compared to just referencing you towards the original write up about the changes I did the first time around. You'll get more explanations and such, I think it's more worth it :)

- ...and optional ListTag values
- RootTagLike (& RootTag default return types)
- Run-Time List Item Type Check (SNBT)
- Format Options Generic Reverting

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