partially fix clang compilation (#893)

* partially fix clang compilation

Missing header and mistaken algorithm usage.

Also removed it name from range loops. It's not correct.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

* run through clang's -Wrange-loop-analysis

Some range loops should not use references as they need to copy.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

* manual range loop conversions

Signed-off-by: Rosen Penev <rosenp@gmail.com>

test/integration/load_node_test.cpp

@@ -254,7 +254,7 @@ TEST(NodeTest, IncompleteJson) {
       {"JSON map without end brace", "{\"access\":\"abc\"",
        ErrorMsg::END_OF_MAP_FLOW},
   };
-  for (const ParserExceptionTestCase test : tests) {
+  for (const ParserExceptionTestCase& test : tests) {
     try {
       Load(test.input);
       FAIL() << "Expected exception " << test.expected_exception << " for "