Unused libraries are checked into the repository

[fulldecent]

Some code is included in the repository but is not used.

Unused code increases project complexity, reduces build time and creates a risk that stale and unfit code will be used later.

Recommendation: remove ESDSA and other unused files.

^^ I understand ESDSA is part of contracts-wip. That should be a separate branch ^^

References:

• One example used file: https://github.com/erasureprotocol/erasure-protocol/blob/4a3d98ce023a264a9f3c7ba62ef77a9207bba5fe/contracts/helpers/openzeppelin-solidity/cryptography/ECDSA.sol