Test fix

To the best of my knowledge, this PR brings all of the tests back online. A few of the wallet tests have been deleted, but that's because they were utterly trivial and didn't really test what they originally claimed. (This was a result of changing the testing style).

Some very minor organizational stuff happened. For example, the miner is now a proper module.

I do feel like the synchronization problems have not really been addressed at all, but maybe they were never addressed in the first place, which would explain why everything appears to work again.