scripted-diff: remove Optional & nullopt

-BEGIN VERIFY SCRIPT-
git rm src/optional.h

sed -i -e 's/Optional</std::optional</g' $(git grep -l 'Optional<' src)

sed -i -e 's/{nullopt}/{std::nullopt}/g' $(git grep -l 'nullopt' src)
sed -i -e 's/ nullopt;/ std::nullopt;/g' $(git grep -l 'nullopt' src)
sed -i -e 's/ nullopt)/ std::nullopt)/g' $(git grep -l 'nullopt' src)
sed -i -e 's/(nullopt)/(std::nullopt)/g' $(git grep -l 'nullopt' src)
sed -i -e 's/ nullopt,/ std::nullopt,/g' $(git grep -l 'nullopt' src)
sed -i -e 's/? nullopt :/? std::nullopt :/g' $(git grep -l 'nullopt' src)
sed -i -e 's/: nullopt}/: std::nullopt}/g' $(git grep -l 'nullopt' src)

sed -i -e '/optional.h \\/d' src/Makefile.am

sed -i -e '/#include <optional.h>/d' src/test/fuzz/autofile.cpp src/test/fuzz/buffered_file.cpp src/test/fuzz/node_eviction.cpp

sed -i -e 's/#include <optional.h>/#include <optional>/g' $(git grep -l '#include <optional.h>' src)
-END VERIFY SCRIPT-

src/qt/test/addressbooktests.cpp

@@ -112,7 +112,7 @@ void TestAddAddressesToSendBook(interfaces::Node& node)
     ClientModel clientModel(node, &optionsModel);
     AddWallet(wallet);
     WalletModel walletModel(interfaces::MakeWallet(wallet), clientModel, platformStyle.get());
-    RemoveWallet(wallet, nullopt);
+    RemoveWallet(wallet, std::nullopt);
     EditAddressDialog editAddressDialog(EditAddressDialog::NewSendingAddress);
     editAddressDialog.setModel(walletModel.getAddressTableModel());
 

src/qt/test/wallettests.cpp

@@ -167,7 +167,7 @@ void TestGUI(interfaces::Node& node)
     ClientModel clientModel(node, &optionsModel);
     AddWallet(wallet);
     WalletModel walletModel(interfaces::MakeWallet(wallet), clientModel, platformStyle.get());
-    RemoveWallet(wallet, nullopt);
+    RemoveWallet(wallet, std::nullopt);
     sendCoinsDialog.setModel(&walletModel);
     transactionView.setModel(&walletModel);