C++20 Round 6: range-for loops, throw() -> noexcept

- Convert 8 index-based for loops to range-for in main.cpp:
  CheckTransaction vout, GetValueIn vin, GetP2SHSigOpCount vin,
  ConnectInputs first pass vin, ConnectBlock vtx, Reorganize vConnect,
  block.vtx in CBlock::AcceptBlock
- Convert 4 loops in main.h: CTransaction::ToString vin/vout, CBlock::print vtx/vMerkleTree
- Convert checkqueue.h worker loop to range-for
- Convert script.cpp bitwise NOT loop to range-for
- throw() -> noexcept on 8 allocator constructors/destructors (C++17 removed throw())

src/script.cpp

@@ -751,8 +751,8 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
                     if (stack.size() < 1)
                         return false;
                     valtype& vch = stacktop(-1);
-                    for (unsigned int i = 0; i < vch.size(); i++)
-                        vch[i] = ~vch[i];
+                    for (auto& b : vch)
+                        b = ~b;
                 }
                 break;