[ref] whole: migrate from cryptoxide to ring

Cargo.lock

lib/core/conf/Cargo.toml

lib/core/conf/src/keys.rs

lib/core/conf/src/lib.rs

lib/core/conf/test/v1/keypairs.json

lib/core/conf/test/v2/keypairs.json

lib/core/module/src/lib.rs

lib/crypto/Cargo.toml

lib/crypto/src/keys/bin_signable.rs

lib/crypto/src/keys/ed25519.rs

lib/crypto/src/keys/mod.rs

lib/crypto/src/keys/seed.rs

lib/crypto/src/keys/text_signable.rs

lib/crypto/src/lib.rs

lib/crypto/src/rand/mod.rs

lib/dubp/block-doc/src/block.rs

lib/dubp/block-doc/src/block/v10.rs

lib/dubp/common-doc/src/traits.rs

lib/dubp/common-doc/src/traits/text.rs

lib/dubp/user-docs/src/documents/certification/v10.rs