Remove CCryptoKeyStore and move all of it's functionality into CWallet

Instead of having a separate CCryptoKeyStore that handles the encryption
stuff, just roll it all into CWallet.

src/interfaces/wallet.cpp

@@ -476,7 +476,7 @@ public:
     }
     std::unique_ptr<Handler> handleStatusChanged(StatusChangedFn fn) override
     {
-        return MakeHandler(m_wallet->NotifyStatusChanged.connect([fn](CCryptoKeyStore*) { fn(); }));
+        return MakeHandler(m_wallet->NotifyStatusChanged.connect([fn](CWallet*) { fn(); }));
     }
     std::unique_ptr<Handler> handleAddressBookChanged(AddressBookChangedFn fn) override
     {