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/checkqueue.h

@@ -72,10 +72,10 @@ private:
             nIdle--;
             lock.unlock();
 
-            for (unsigned int i = 0; i < vChecks.size(); i++)
+            for (auto& check : vChecks)
             {
                 if (fOk)
-                    fOk = vChecks[i]();
+                    fOk = check();
             }
             vChecks.clear();