Introduce the ExpandedSignerList amendment:

The amendment increases the maximum sign of an account's signer
list from 8 to 32.

Like all new features, the associated amendment is configured with
a default vote of "no" and server operators will have to vote for
it explicitly if they believe it is useful.

src/ripple/rpc/impl/GRPCHelpers.cpp

@@ -746,6 +746,14 @@ populateSignerListID(T& to, STObject const& from)
         [&to]() { return to.mutable_signer_list_id(); }, from, sfSignerListID);
 }
 
+template <class T>
+void
+populateWalletLocator(T& to, STObject const& from)
+{
+    populateProtoPrimitive(
+        [&to]() { return to.mutable_wallet_locator(); }, from, sfWalletLocator);
+}
+
 template <class T>
 void
 populateTicketSequence(T& to, STObject const& from)
@@ -1012,6 +1020,7 @@ populateSignerEntries(T& to, STObject const& from)
         [](auto& innerObj, auto& innerProto) {
             populateAccount(innerProto, innerObj);
             populateSignerWeight(innerProto, innerObj);
+            populateWalletLocator(innerProto, innerObj);
         },
         from,
         sfSignerEntries,