Major overhaul of project structure

[badtuple]

I'm coming back to the project and the vision for it is still the same, but I'm going to overhaul the structure to better support rigorous testing and modularity. I may also pull in pipelang as a crate within the workspace.

Along with this I'm moving to the most recent Rust stable and updating all dependencies. Previously we were using nightly but I think all nightly features we used have been stabilized at this point.

I don't think anyone is actively working on Remits right now though there are some forks, so I wanted to make an issue just incase and let people know over the next week or so I'm going to be rebasing and changing things freely on master. At a certain point I'll close this issue so people know it's safe to rebase/repull and not have to worry about finding ways to reconcile the main branch.