Merge #15450: gui: Create wallet menu option

613de61a04 Add Create Wallet menu action (Andrew Chow)
9b41cbb28f Expose wallet creation to the GUI via WalletController (Andrew Chow)
78863e2900 Add CreateWalletDialog to create wallets from the GUI (Andrew Chow)
60adb21c7a Optionally allow AskPassphraseDialog to output the passphrase (Andrew Chow)
bc6d8a3662 gui: Refactor OpenWalletActivity (João Barbosa)

Pull request description:

  This PR adds a menu option to create a new wallet. When clicked, a `CreateWalletDialog` will be created and prompt the user to name the wallet and choose whether to disable private keys, make a blank wallet, and encrypt the wallet. If the wallet is encrypted, the wallet will be born encrypted with the wallet first created blank, then encrypted, and then a new HD seed generated and set.

  To allow the newly created wallets to be encrypted, some changes to how encrypting a wallet works. Instead of encrypting and locking the wallet, the wallet will be encrypted and then unlocked. This is also an extra belt-and-suspenders check to make sure that encryption worked.

ACKs for top commit:
  fanquake:
    ACK 613de61a04 - re-reviewed on macOS. I'm going to merge this now. It's had a stack of review, and as mentioned multiple times above, lets get this into `master` so it can get more testing pre `v0.19.0`.

Tree-SHA512: 3f22cc20b13703ffc90d366ae9133114832fea77f4f319da7fd85eb454f2f0bd5d7e1e6e20284dea2f370d8574f83b45669dcbbe506b994410d32e8e7a6fa877

contrib/bitcoin-qt.pro

@@ -16,6 +16,7 @@ FORMS += \
     ../src/qt/forms/sendcoinsentry.ui \
     ../src/qt/forms/signverifymessagedialog.ui \
     ../src/qt/forms/transactiondescdialog.ui \
+    ../src/qt/forms/createwalletdialog.ui
 
 RESOURCES += \
     ../src/qt/bitcoin.qrc