Change derivation path for the keychain

[prix-uniris]

This is PR to Issue #34 for this repository.

Additions:
New Derivation path scheme with paths as m\650'\0'\0' (m\650'\account'\index')
New Encoding scheme for wallets as derivation paths are now inside the encoded wallet services
APDU Command Updates

• For Address send service_index for which address needs be derived in the encoded wallet.
  • APDU Command as e0040000 + service_index(1 byte) + encrypted_key (n bytes) + encrypted_onchain_wallet (n bytes)
• For Signature, Supply the service index for whose's derivation paths need to sign the payload aka transaction hash. For now, only support for uco transfer transaction hashes.
  • APDU Command as e0080000 + service_index(1 byte) + reciever_addr (n bytes) + amount (8 bytes) + encrypted_key (n bytes) + encrypted_onchain_wallet (n bytes)

Deletions:
Old Derivation Paths
Variable Names from bip44 to derivation paths