Electrum ABC 5.4.0

• Remove explorer.bitcoinabc.org from the list of available block
  explorers (D16875).
• Improve compliance with the JSONRPC 2.0 spec (D17185).
• Implement autocompletion when recovering wallets from mnemonic seed
  phrases. This makes wallet restoration faster and less error-prone.
  (D17569).
• Make the derivation path scanner support passphrase protected BIP-39
  and SLI-P39 mnemonics (D17576).
• Trezor related features and bugfixes:
  • Support Trezor Safe 5 hardware wallets (D17294).
  • Add native support for Trezor devices. New wallets created with the
    latest firmware installed on the device will now use the 899'
    derivation path, show amounts in XEC units and display ecash:
    addresses (D17129).
  • Support initializing or recovering a Trezor device with a SLIP-39
    seed phrase (D17555).
  • Support software recovery of SLIP-39 (Shamir Backup) wallets (D17577).
  • Support Trezor's seedless mode for redundant multisig setups when
    initializing a device (D17553).
  • Support Trezor One devices that are locked with a PIN longer than 9
    digits (D17561).
  • Fix a race that prevented the "Check your Trezor" popup to be properly
    closed after validating a passphrase on the device (D17547, D17563).
  • Fix the home screen image customization for all Trezor devices
    (D17546, D17554).
  • Fix resetting of the home screen image (D17578).
  • Provide 1-click way to set the eCash logo as the home screen image
    (D17579).