account IDs not displayed properly by print-xdr

[MonsieurNicolas]

Version: 13.0.0

cat <<EOF | base64 -d > txEnvelope.xdr
AAAAAgAAAAAx6z54QxsYlIVyqE2qMVIYC0Q7uuTtM8drEACF449HMAAAAGQAAzWGAAAAAQAAAAAA
AAAAAAAAAQAAAAEAAAEAAAAAAAAAAAAx6z54QxsYlIVyqE2qMVIYC0Q7uuTtM8drEACF449HMAAA
AAEAAAEAAAAAAAAAAHv6UDmDcK48NbjcDmjDKE80W2EhLb7kwZSwjoKlg7eiWQAAAAAAAAAAAAAD
6AAAAAAAAAAB449HMAAAAEA5NEgz0COUMYtTDvv7ycfX56zj1pEO4hyjfK/Ko40fyHyy37ShQu4s
z3myO5kmZEn4LI84jMCwXCYycfgxnxMI
EOF

# ./stellar-core print-xdr txEnvelope.xdr
TransactionEnvelope = {
  type = ENVELOPE_TYPE_TX,
  v1 = {
    tx = {
      sourceAccount = {
        type = KEY_TYPE_ED25519,
        ed25519 = 31eb3e78431b18948572a84daa3152180b443bbae4ed33c76b100085e38f4730
      },
      fee = 100,
      seqNum = 903274572021761,
      timeBounds = NULL,
      memo = {
        type = MEMO_NONE
      },
      operations = [
        { sourceAccount = {
            type = KEY_TYPE_MUXED_ED25519,
            med25519 = {
              id = 0,
              ed25519 = 31eb3e78431b18948572a84daa3152180b443bbae4ed33c76b100085e38f4730
            }
          },
          body = {
            type = PAYMENT,
            paymentOp = {
              destination = {
                type = KEY_TYPE_MUXED_ED25519,
                med25519 = {
                  id = 123,
                  ed25519 = fa50398370ae3c35b8dc0e68c3284f345b61212dbee4c194b08e82a583b7a259
                }
              },
              asset = {
                type = ASSET_TYPE_NATIVE
              },
              amount = 1000
            }
          } }
      ],
      ext = {
        v = 0
      }
    },
    signatures = [
      { hint = e38f4730,
        signature = 39344833d02394318b530efbfbc9c7d7e7ace3d6910ee21ca37cafcaa38d1fc87cb2dfb4a142ee2ccf79b23b99266449f82c8f388cc0b05c263271f8319f1308 }
    ]
  }
}

Couple issues here:

regular accounts are displayed in hex:

sourceAccount = {
        type = KEY_TYPE_ED25519,
        ed25519 = 31eb3e78431b18948572a84daa3152180b443bbae4ed33c76b100085e38f4730
      }

I would expect this to be displayed as
sourceAccount = GAY6WPTYIMNRRFEFOKUE3KRRKIMAWRB3XLSO2M6HNMIABBPDR5DTA3IY

Multiplexed accounts are also displayed in hex:

destination = {
                type = KEY_TYPE_MUXED_ED25519,
                med25519 = {
                  id = 123,
                  ed25519 = fa50398370ae3c35b8dc0e68c3284f345b61212dbee4c194b08e82a583b7a259
                }

Here I would expect this to be displayed as something like:
sourceAccount = { id=123, accountID=GD5FAOMDOCXDYNNY3QHGRQZIJ42FWYJBFW7OJQMUWCHIFJMDW6RFS6XQ }

Note: we should not display multiplexed accounts like above with the alternative StrKey representation M... (as defined in SEPs) as core only reasons about LedgerKeys that are identified by G strkeys.