Nimbilize

[lantos1618]

Making some of the functions public and starting to make the folder structure confirm with nimble package init structure.
Added jsony, stew and gmp requirements. Note they are not bound to a version atm.

should pkg be removed from all files? example:
-- pkg/jsony
++ jsony

tests seem to pass but there is this warning which is assumed to fail?
[WARNING] Skipping - deserialization_fails_too_many_bytes.json

[lantos1618]

@mratsim

[mratsim]

Nimble init structure is broken.

Nimble drops src on install which requires all the code to use different resolution paths depending if the package is installed or git cloned. As stated in #111 (comment), I'm not going back to src and using srcDir as long as this is the case. It is especially important for a cryptographic lib, especially with assembly, that test vectors are available upon install to check the installation, as are docs, future examples, benchmarks, ...

Furthermore jsony, stew, gmp are test-only dependencies. It is key that Constantine has no dependencies as the most prolific attack vector right now is supply-chain attacks on Pypi and NPM. Again, this is a nimble limitation that I suggested to solve 4 years ago: nim-lang/nimble#482.

Recent example on supply chain attacks: https://blog.sonarsource.com/securing-developer-tools-package-managers with Pypi refusing to fix the attack vector, leaving Python devs prey to those ...

[mratsim]

This PR is significantly outdated, would probably be easier to restart from scratch so closing.