[mod] Move helpers.py to tools.py to avoid confusion with the introduction of helpers

duniterpy/documents/crc_pubkey.py

@@ -4,7 +4,7 @@ import base58
 import re
 import hashlib
 from ..constants import PUBKEY_REGEX
-from ..helpers import ensure_str
+from ..tools import ensure_str
 
 # required to type hint cls in classmethod
 CRCPubkeyType = TypeVar("CRCPubkeyType", bound="CRCPubkey")

duniterpy/key/base58.py

@@ -2,7 +2,7 @@ from typing import Union
 
 import base58
 
-from ..helpers import ensure_str, ensure_bytes
+from ..tools import ensure_str, ensure_bytes
 
 
 class Base58Encoder:

duniterpy/key/encryption_key.py

@@ -10,7 +10,7 @@ from pylibscrypt import scrypt
 
 from .scrypt_params import ScryptParams
 from .base58 import Base58Encoder
-from ..helpers import ensure_bytes
+from ..tools import ensure_bytes
 
 
 class SecretKey(libnacl.public.SecretKey):

duniterpy/key/signing_key.py

@@ -13,7 +13,7 @@ from pylibscrypt import scrypt
 
 from .scrypt_params import ScryptParams
 from .base58 import Base58Encoder
-from ..helpers import (
+from ..tools import (
     ensure_bytes,
     xor_bytes,
     convert_seedhex_to_seed,