Hardware Wallet settings

[ovitrif]

Part of #998.

Scope

Implement Hardware Wallet settings:

• Add a row in Settings > General > Payments.
• Row value shows paired-device count.
• Add Hardware Wallets Settings Screen:
  • paired device list
  • device name
  • balance
  • green connection indicator when connected
  • per-row delete
  • Add Hardware Wallet button
• Add Hardware Wallet opens the Connect Hardware flow.