client binary

[SupremoUGH]

New:

• Client binary
• abstract client protocol in client.rs
• concrete Ceremony implementation in ppot

Before approving this PR, please test the client binary exhaustively against the server on https://ceremony.manta.network, and report any unwanted behaviour.

Bug

After some testing, I noticed a bug related to Term::stdout. When the terminal is on full-screen and you are queuing, it works fine. When the terminal is not on fullscreen, the method clear_last_lines() doesn't work and the client gets infinite waiting in queue messages.
If you change the message to remove the last \n, then it works when not on fullscreen, but on FS it eats all lines above the queue message.

How do we solve this?

Closes #125

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• Linked to an issue with discussion and accepted design OR have an explanation in the PR that describes this work.
• Added one line describing your change in CHANGELOG.md and added the appropriate changelog label to the PR.
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• Checked that changes and commits conform to the standards outlined in CONTRIBUTING.md.

[bhgomes]

Bug

After some testing, I noticed a bug related to Term::stdout. When the terminal is on full-screen and you are queuing, it works fine. When the terminal is not on fullscreen, the method clear_last_lines() doesn't work and the client gets infinite waiting in queue messages. If you change the message to remove the last \n, then it works when not on fullscreen, but on FS it eats all lines above the queue message.

How do we solve this?

This seems resolved by the way.