Organization refactor

[AntoineRondelet]

This PR:

1. Re-arranges the content of the repository
2. Packages the different targets into:
   • libzeth
   • prover_server
   • mpc_tools
     • pot-process
     • phase 2 binaries
3. Provides a small refactor of the CMakeFiles according to the point above and removed use of environment variables
4. Fixes inconsistencies in include directives
5. Renames the mpc commands to mpc-<role>-phase2, where <role> is either coord (for coordinator) or client
6. Removes the coinstore, trusted_setup and keystore directories which are now ignored from the git flow but are created locally via the setup script

Not addressed in this ticket, but "to do":

• Rename pyClient to py_client to stick to the snake case naming convention
• Rename coinstore to notestore to be consistent with the vocabulary of Zeth
• Rename zeth-contracts to zeth_contracts to stick to the snake case naming convention
• Make sure to document all dependencies and the associated versions (e.g the "progress bar" option of pip seems to be only supported from v10 onward: Allow passing a --no-progress-bar to the install script to surpress progress bar pypa/pip#4194. As such calling the mpc script with a pip of version < 10.0 will cause an error (https://github.com/clearmatics/zeth/blob/develop/scripts/mpc_setup#L20). Likewise, some scripts assume that truffle is installed.), and we need to specify which version of clang-format is required to run the formatting script (especially if we want to use the script in a git hook Added pre-commit hook to run format script #173)

[dtebbs]

Rename pyClient to py_client to stick to the snake case naming convention
(For later ...) Perhaps we can rename to just client instead now that the js version has been removed.

[AntoineRondelet]

Rename pyClient to py_client to stick to the snake case naming convention
(For later ...) Perhaps we can rename to just client instead now that the js version has been removed.

Sure client works well

[dtebbs]

Some inconsistent local includes still remaining:

$ git grep 'include <libzeth'
libzeth/circuits/circuits-utils.cpp:#include <libzeth/circuits/circuits-utils.hpp>
libzeth/circuits/commitments/commitment.hpp:#include <libzeth/circuits/commitments/commitment.tcc>
libzeth/circuits/merkle_tree/merkle_path_selector.hpp:#include <libzeth/circuits/merkle_tree/merkle_path_selector.tcc>
libzeth/circuits/notes/note.tcc:#include <libzeth/circuits/notes/note.hpp>
libzeth/circuits/safe_arithmetic.cpp:#include <libzeth/circuits/safe_arithmetic.hpp>
libzeth/circuits/sha256/sha256_ethereum.hpp:#include <libzeth/circuits/sha256/sha256_ethereum.tcc>
libzeth/circuits/sha256/sha256_ethereum.tcc:#include <libzeth/circuits/circuits-utils.hpp>
libzeth/libsnark_helpers/debug_helpers.hpp:#include <libzeth/libsnark_helpers/debug_helpers.tcc>
libzeth/libsnark_helpers/extended_proof.tcc:#include <libzeth/snarks_core_imports.hpp>
libzeth/snarks/groth16/core/computation.tcc:#include <libzeth/snarks/groth16/core/computation.hpp>
libzeth/snarks/groth16/mpc/chacha_rng.cpp:#include <libzeth/snarks/groth16/mpc/chacha_rng.hpp>
libzeth/snarks/groth16/mpc/multi_exp.tcc:#include <libzeth/snarks/groth16/mpc/multi_exp.hpp>
libzeth/snarks/groth16/mpc/phase2.cpp:#include <libzeth/snarks/groth16/mpc/phase2.hpp>
libzeth/snarks/groth16/mpc/powersoftau_utils.cpp:#include <libzeth/snarks/groth16/mpc/powersoftau_utils.hpp>
libzeth/test/mimc_mp_test.cpp:#include <libzeth/circuits/mimc/mimc_mp.hpp>
libzeth/test/simple_test.hpp:#include <libzeth/include_libsnark.hpp>
libzeth/types/bits.cpp:#include <libzeth/types/bits.hpp>
libzeth/types/bits.tcc:#include <libzeth/types/bits.hpp>
libzeth/types/merkle_tree_field.hpp:#include <libzeth/types/merkle_tree_field.tcc>
libzeth/types/merkle_tree_field.tcc:#include <libzeth/circuits/mimc/mimc_mp.hpp>
libzeth/types/note.hpp:#include <libzeth/types/bits.hpp>
libzeth/util.tcc:#include <libzeth/util.hpp>
libzeth/util_api.cpp:#include <libzeth/util_api.hpp>
libzeth/util_api.tcc:#include <libzeth/util_api.hpp>
mpc_tools/mpc_phase2/cli/mpc_common.hpp:#include <libzeth/circuit_types.hpp>
mpc_tools/mpc_phase2/cli/mpc_phase2_contribute.cpp:#include <libzeth/snarks/groth16/mpc/phase2.hpp>
mpc_tools/mpc_phase2/cli/mpc_phase2_verify_contribution.cpp:#include <libzeth/snarks/groth16/mpc/phase2.hpp>
mpc_tools/mpc_phase2/cli/mpc_phase2_verify_transcript.cpp:#include <libzeth/snarks/groth16/mpc/phase2.hpp>
mpc_tools/mpc_phase2/mpc_client.cpp:#include <libzeth/circuit_wrapper.hpp>
mpc_tools/mpc_phase2/mpc_coord.cpp:#include <libzeth/circuit_wrapper.hpp>
mpc_tools/mpc_phase2/test/mpc_test_cli.cpp:#include <libzeth/test/simple_test.hpp>

[AntoineRondelet]

Thanks @dtebbs ...
I ran a "find and replace" script with a regex to capture the content of <libzeth/(.*)> in a group and use the group to replace with "libzeth/...". I must have done something wrong here, let's me have another look and replace all headers