Review feedback from @Bronek

- Remove unnecessary #include
- Explanatory comments
- Make the MPT InvariantCheck related to EscrowFinish amendment safe
- Convert SField maps to unordered_maps
- Make jtx::fee::operator() clearer
- Rename checkMyPrivilege to hasPrivilege

include/xrpl/protocol/Protocol.h

@@ -22,7 +22,6 @@
 
 #include <xrpl/basics/ByteUtilities.h>
 #include <xrpl/basics/base_uint.h>
-#include <xrpl/basics/partitioned_unordered_map.h>
 
 #include <cstdint>
 

include/xrpl/protocol/SField.h

@@ -300,7 +300,7 @@ public:
     static int
     compare(SField const& f1, SField const& f2);
 
-    static std::map<int, SField const*> const&
+    static std::unordered_map<int, SField const*> const&
     getKnownCodeToField()
     {
         return knownCodeToField;
@@ -308,8 +308,8 @@ public:
 
 private:
     static int num;
-    static std::map<int, SField const*> knownCodeToField;
-    static std::map<std::string, SField const*> knownNameToField;
+    static std::unordered_map<int, SField const*> knownCodeToField;
+    static std::unordered_map<std::string, SField const*> knownNameToField;
 };
 
 /** A field with a type known at compile time. */

include/xrpl/protocol/detail/transactions.macro

@@ -77,7 +77,7 @@ TRANSACTION(ttESCROW_CREATE, 1, EscrowCreate,
 /** This transaction type completes an existing escrow. */
 TRANSACTION(ttESCROW_FINISH, 2, EscrowFinish,
     Delegation::delegatable,
-    mayAuthorizeMPT,
+    noPriv,
     ({
     {sfOwner, soeREQUIRED},
     {sfOfferSequence, soeREQUIRED},