message: allow access to the Addressing's details
diff: use hdpayload::{Path};
  -const BIP44_PURPOSE : u32 = 0x8000002C;
  -const BIP44_COIN_TYPE : u32 = 0x80000717;
  +pub const BIP44_PURPOSE : u32 = 0x8000002C;
  +pub const BIP44_COIN_TYPE : u32 = 0x80000717;
  #[derive(Clone, Serialize, Deserialize, Debug, PartialEq, Eq)]
  pub struct Addressing {
  - account: u32,
  - change: u32,
  - index: u32,
  + pub account: u32,
  + pub change: u32,
  + pub index: u32,
  }
  #[derive(Clone, Serialize, Deserialize, Debug, PartialEq, Eq)]
  