Architectural overhaul

[mjarduk]

So, looking at the codebase, I find it rather important to point out that most of our architecture runs on fumes & TODOs, which, being blunt, is genuinely demonstrating to work with.

I'd like to propose that we:

• Halt feature PRs for the time being, as the underlying propositions will likely break the overall API
• Specify our architectural goals, defining the standards we'd like to uphold on-paper
• Attempt an overhaul of the core library, moving more platform-independent routines into it

Overall, I think CC: Tweaked should act as the role-model for what we're trying to achieve architecturally.

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Funny senseless words aside, I'd like to make said changes in a series of branches:

• Fix the bigger TODOs we have, smooth out the API a bit. (Make UUID changes immutable & add network splitting #36)
• Split Core into Core & CoreApi, hopefully making API design more deliberate.
• Create unit, regression, so on so forth tests, allowing us to actually check for errors in a way that wouldn't require launching minecraft.