theohax

Disabled in https://github.com/nanocurrency/nano-node/pull/3629 CI run in which it failed: [here](https://github.com/nanocurrency/nano-node/runs/4691644987?check_suite_focus=true#step:5:2109)

Disabled in https://github.com/nanocurrency/nano-node/pull/3629 CI run in which it failed: [here](https://github.com/nanocurrency/nano-node/runs/4691644731?check_suite_focus=true#step:5:1869)

Disabled in https://github.com/nanocurrency/nano-node/pull/3629 CI run in which it failed: [here](https://github.com/nanocurrency/nano-node/runs/4691644731?check_suite_focus=true#step:5:1868)

Use ledger_walker from within the confirmation_height_processor

1

The ugly ifdefs can be taken out (together with the ones from `ledger_walker.cpp`) pretty soon once everything is stable with diskhash on Windows. Besides that, this PR adds the `run_walker`...