refactor: Use C++11 range based for loops to simplify rpc code

src/rpc/misc.cpp

@@ -619,7 +619,7 @@ static const CRPCCommand commands[] =
     { "hidden",             "echojson",               &echo,                   {"arg0","arg1","arg2","arg3","arg4","arg5","arg6","arg7","arg8","arg9"}},
 };
 // clang-format on
-
-    for (unsigned int vcidx = 0; vcidx < ARRAYLEN(commands); vcidx++)
-        t.appendCommand(commands[vcidx].name, &commands[vcidx]);
+    for (const auto& c : commands) {
+        t.appendCommand(c.name, &c);
+    }
 }