Merge #18317: Serialization improvements step 6 (all except wallet/gui)

f9ee0f37c2 Add comments to CustomUintFormatter (Pieter Wuille)
4eb5643e35 Convert everything except wallet/qt to new serialization (Pieter Wuille)
2b1f85e8c5 Convert blockencodings_tests to new serialization (Pieter Wuille)
73747afbbe Convert merkleblock to new serialization (Pieter Wuille)
d06fedd1bc Add SER_READ and SER_WRITE for read/write-dependent statements (Russell Yanofsky)
6f9a1e5ad0 Extend CustomUintFormatter to support enums (Russell Yanofsky)
769ee5fa00 Merge BigEndian functionality into CustomUintFormatter (Pieter Wuille)

Pull request description:

  The next step of changes from #10785.

  This:
  * Adds support for enum serialization to `CustomUintFormatter`, used in `CAddress` for service flags.
  * Merges `BigEndian` into `CustomUintFormatter`, used in `CNetAddr` for port numbers.
  * Converts everything (except wallet and gui) to use the new serialization framework.

ACKs for top commit:
  MarcoFalke:
    re-ACK f9ee0f37c2, only change is new documentation commit for CustomUintFormatter 📂
  ryanofsky:
    Code review ACK f9ee0f37c2. Just new commit adding comment since last review
  jonatack:
    Code review re-ACK f9ee0f37c2 only change since last review is an additional commit adding Doxygen documentation for `CustomUintFormatter`.

Tree-SHA512: e7a0a36afae592d5a4ff8c81ae04d858ac409388e361f2bc197d9a78abca45134218497ab2dfd6d031e0cce0ca586cf857077b7c6ce17fccf67e2d367c1b6cd4

src/primitives/block.h

@@ -33,17 +33,7 @@ public:
         SetNull();
     }
 
-    ADD_SERIALIZE_METHODS;
-
-    template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action) {
-        READWRITE(this->nVersion);
-        READWRITE(hashPrevBlock);
-        READWRITE(hashMerkleRoot);
-        READWRITE(nTime);
-        READWRITE(nBits);
-        READWRITE(nNonce);
-    }
+    SERIALIZE_METHODS(CBlockHeader, obj) { READWRITE(obj.nVersion, obj.hashPrevBlock, obj.hashMerkleRoot, obj.nTime, obj.nBits, obj.nNonce); }
 
     void SetNull()
     {
@@ -89,12 +79,10 @@ public:
         *(static_cast<CBlockHeader*>(this)) = header;
     }
 
-    ADD_SERIALIZE_METHODS;
-
-    template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action) {
-        READWRITEAS(CBlockHeader, *this);
-        READWRITE(vtx);
+    SERIALIZE_METHODS(CBlock, obj)
+    {
+        READWRITEAS(CBlockHeader, obj);
+        READWRITE(obj.vtx);
     }
 
     void SetNull()
@@ -131,14 +119,12 @@ struct CBlockLocator
 
     explicit CBlockLocator(const std::vector<uint256>& vHaveIn) : vHave(vHaveIn) {}
 
-    ADD_SERIALIZE_METHODS;
-
-    template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action) {
+    SERIALIZE_METHODS(CBlockLocator, obj)
+    {
         int nVersion = s.GetVersion();
         if (!(s.GetType() & SER_GETHASH))
             READWRITE(nVersion);
-        READWRITE(vHave);
+        READWRITE(obj.vHave);
     }
 
     void SetNull()

src/primitives/transaction.h

@@ -26,13 +26,7 @@ public:
     COutPoint(): n(NULL_INDEX) { }
     COutPoint(const uint256& hashIn, uint32_t nIn): hash(hashIn), n(nIn) { }
 
-    ADD_SERIALIZE_METHODS;
-
-    template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action) {
-        READWRITE(hash);
-        READWRITE(n);
-    }
+    SERIALIZE_METHODS(COutPoint, obj) { READWRITE(obj.hash, obj.n); }
 
     void SetNull() { hash.SetNull(); n = NULL_INDEX; }
     bool IsNull() const { return (hash.IsNull() && n == NULL_INDEX); }
@@ -103,14 +97,7 @@ public:
     explicit CTxIn(COutPoint prevoutIn, CScript scriptSigIn=CScript(), uint32_t nSequenceIn=SEQUENCE_FINAL);
     CTxIn(uint256 hashPrevTx, uint32_t nOut, CScript scriptSigIn=CScript(), uint32_t nSequenceIn=SEQUENCE_FINAL);
 
-    ADD_SERIALIZE_METHODS;
-
-    template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action) {
-        READWRITE(prevout);
-        READWRITE(scriptSig);
-        READWRITE(nSequence);
-    }
+    SERIALIZE_METHODS(CTxIn, obj) { READWRITE(obj.prevout, obj.scriptSig, obj.nSequence); }
 
     friend bool operator==(const CTxIn& a, const CTxIn& b)
     {
@@ -143,13 +130,7 @@ public:
 
     CTxOut(const CAmount& nValueIn, CScript scriptPubKeyIn);
 
-    ADD_SERIALIZE_METHODS;
-
-    template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action) {
-        READWRITE(nValue);
-        READWRITE(scriptPubKey);
-    }
+    SERIALIZE_METHODS(CTxOut, obj) { READWRITE(obj.nValue, obj.scriptPubKey); }
 
     void SetNull()
     {