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/node/psbt.h

@@ -25,18 +25,18 @@ struct PSBTInputAnalysis {
  * Holds the results of AnalyzePSBT (miscellaneous information about a PSBT)
  */
 struct PSBTAnalysis {
-    Optional<size_t> estimated_vsize;      //!< Estimated weight of the transaction
-    Optional<CFeeRate> estimated_feerate;  //!< Estimated feerate (fee / weight) of the transaction
-    Optional<CAmount> fee;                 //!< Amount of fee being paid by the transaction
+    std::optional<size_t> estimated_vsize;      //!< Estimated weight of the transaction
+    std::optional<CFeeRate> estimated_feerate;  //!< Estimated feerate (fee / weight) of the transaction
+    std::optional<CAmount> fee;                 //!< Amount of fee being paid by the transaction
     std::vector<PSBTInputAnalysis> inputs; //!< More information about the individual inputs of the transaction
     PSBTRole next;                         //!< Which of the BIP 174 roles needs to handle the transaction next
     std::string error;                     //!< Error message
 
     void SetInvalid(std::string err_msg)
     {
-        estimated_vsize = nullopt;
-        estimated_feerate = nullopt;
-        fee = nullopt;
+        estimated_vsize = std::nullopt;
+        estimated_feerate = std::nullopt;
+        fee = std::nullopt;
         inputs.clear();
         next = PSBTRole::CREATOR;
         error = err_msg;