Fix several clazy issue:

* Missing reference in range-for with non trivial type [-Wclazy-range-loop-reference]

src/App/DocumentObjectPyImp.cpp

@@ -696,7 +696,7 @@ PyObject*  DocumentObjectPy::getPathsByOutList(PyObject *args)
                 (o)->getDocumentObjectPtr();
         auto array = getDocumentObjectPtr()->getPathsByOutList(target);
         Py::List list;
-        for (auto it : array) {
+        for (const auto& it : array) {
             Py::List path;
             for (auto jt : it) {
                 path.append(Py::asObject(jt->getPyObject()));

src/App/ExtensionContainer.h

@@ -137,7 +137,7 @@ public:
     template<typename ExtensionT>
     std::vector<ExtensionT*> getExtensionsDerivedFromType() const {
         std::vector<ExtensionT*> typevec;
-        for(auto entry : _extensions) {
+        for(const auto& entry : _extensions) {
             if(entry.first.isDerivedFrom(ExtensionT::getExtensionClassTypeId()))
                 typevec.push_back(static_cast<ExtensionT*>(entry.second));
         }