WIP: zingo-cli regtest mode invocation

[dannasessha]

Working toward #17 - For now this is just a README update.

If you'd like to see the abstract path setup or specific naming of what I'm about to build into the tool this is a good moment to comment.

Problem:
I couldn't get the zcashd to write to the debug.log file at all. I saw this issue on zcash's page, which is listed as a 'good first issue' but it's a bit beyond me, at least at a glance, wasn't sure if it could be a lead on this issue but I'd like another dev to confirm this isn't working for them, or point out what I've done wrong.

Maybe there's other logging or metrics you'd like to capture @zancas ? I was thinking about trying to timestamp log files, for example.

I'm concerned about these kinds of issues too, so I'd like to have those kinds of updates(or reassurance I shouldn't worry!) in place before moving around more Rust.

[codecov-commenter]

Codecov Report

Merging #26 (3db9367) into dev (ddf8261) will decrease coverage by 1.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##              dev      #26      +/-   ##
==========================================
- Coverage   58.22%   57.20%   -1.02%     
==========================================
  Files          30       30              
  Lines        5838     5942     +104     
==========================================
  Hits         3399     3399              
- Misses       2439     2543     +104     

Impacted Files	Coverage Δ
cli/src/lib.rs	0.00% <ø> (ø)
cli/src/main.rs	0.00% <0.00%> (ø)

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[dannasessha]

In conversation: "the regtest specific information should go in a README.md inside the regtest directory"

[dannasessha]

In further conversation "dump all binaries in regtest/bin"

[dannasessha]

I now don't like the base regtest directory, which I thought of shortly after working on it again today...

...now there's /zingolib/regtest/datadir/zcash/regtest/ and /zingolib/regtest/datadir/lightwalletd/db/regtest/ ...

I'd like to change that to something unique. Also, I know regtest is the feature, but it strikes me that with zcashd and lightwalletd making "regtest" specific subdirectories, maybe we should consider having this be an overall ... modes subdirectory, which could use testnet and mainnet too? Provide a harness for that... I see it's a bit beyond the scope right now but keeping an eye out for extensibility. RFC.

[dannasessha]

Still also:
-I'm not getting zcashd to log the way I want or expect.
-LWD's YAML file includes zcash-conf-path but I'm not sure it's actually doing anything.

[dannasessha]

Overall, this is looking really promising. Please refactor such that there are no typehints.

This is done, along with some other stuff too. I'd say all the core functions are in place now, but the code should be cleaned up and maybe minimized, as well as probably moved to another mod.

[zancas]

This is coming along!!

Please add logic to handle graceful shut-down of spawned threads.

When the user instructs the zingo-cli to shutdown it must:

• announce that it was instructed to shutdown
• issue proper shutdown commands to each spawned process
• report progress to the user
• monitor the behavior of its spawned processes
• report success-or-failure of spawn shutdowns
• shut itself down

[zancas]

This is a significant, functional piece of work. It should be merged.

[zancas]

I removed the DRAFT label. There are next steps, but this is a coherent chunk, and should be landed.

[zancas]

This is a coherent chunk.