Collapse console I/O interfaces into InputProcessor, drop unneeded atomics

InputProvider/OutputProvider each had one implementation and no test
exercised the seam, so fold Console{Input,Output}Provider straight into
InputProcessor and update Menu/MenuCommand call sites accordingly.

Account and Event both use AtomicInteger for a ledger/trade id counter
that's only ever touched next to a plain, non-thread-safe ArrayList add
in the same method - the atomic bought no real thread-safety. Swapped
both to plain int with ++.

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