All over the place

I'm not really sure what happened with this PR. It started with me just wanting to make some tests, but then for some reason I was working on the front end. I'm not really sure what the flow was from there-to-here, but the end result is that the wallet interface has been cleaned up a bit, the api has been cleaned up a bit, the front end has been cleaned up a bit, at least with regards to wallets.

Sorry about the explosion of stuff. I think at some point I decided to clean up pretty much everything with regards to wallets & the wallet code. There are still a few bugs that I'm running into but I wanted to open this as it's already pretty monstrous.

Bugs should be fixed later today, hopefully accompanied by unit tests that can trigger them.
No it means the wallet doesn't know how to spend that output. It means the coins don't belong to you, they belong to someone else.