[ZcF-general] zec-qt-wallet update

[adityapk]

This week
- Added ability to connect over Tor
- RPC improvements to help large wallets load easily.
- Few community-requested features (Balances on the Tx window, Max button with custom fees, Previously used addresses, Warning if no peers)

Next week
- Wrap up feature work, close issues
- Add tests and improve code so we can maintain it properly going forward