Merge #15101: gui: Add WalletController

0dd9bdefa gui: Refactor to use WalletController (João Barbosa)
8fa271f08 gui: Add WalletController (João Barbosa)
cefb399e2 gui: Use AutoConnection for WalletModel::unload signal (João Barbosa)

Pull request description:

  This PR is a subset of the work done in the context of #13100. This change consists in extracting from the application class the code that manages the wallet models.

  The role of the `WalletController` instance is to coordinate wallet operations and the window.

Tree-SHA512: 6a824054376730eb7d16c643dd2003f5f60778e8ad3af707b82bc12c48438db179ca4446316b28fb17b206f4b9aba8998419aab8c5dd1f7c32467015732b5094

src/qt/bitcoin.h

@@ -19,6 +19,7 @@ class NetworkStyle;
 class OptionsModel;
 class PaymentServer;
 class PlatformStyle;
+class WalletController;
 class WalletModel;
 
 namespace interfaces {
@@ -93,8 +94,6 @@ public Q_SLOTS:
     void shutdownResult();
     /// Handle runaway exceptions. Shows a message box with the problem and quits the program.
     void handleRunawayException(const QString &message);
-    void addWallet(WalletModel* walletModel);
-    void removeWallet();
 
 Q_SIGNALS:
     void requestedInitialize();
@@ -110,9 +109,8 @@ private:
     BitcoinGUI *window;
     QTimer *pollShutdownTimer;
 #ifdef ENABLE_WALLET
-    PaymentServer* paymentServer;
-    std::vector<WalletModel*> m_wallet_models;
-    std::unique_ptr<interfaces::Handler> m_handler_load_wallet;
+    PaymentServer* paymentServer{nullptr};
+    WalletController* m_wallet_controller{nullptr};
 #endif
     int returnValue;
     const PlatformStyle *platformStyle;