scripted-diff: Use the C++11 keyword nullptr to denote the pointer literal instead of the macro NULL

-BEGIN VERIFY SCRIPT-
sed -i 's/\<NULL\>/nullptr/g' src/*.cpp src/*.h src/*/*.cpp src/*/*.h src/qt/*/*.cpp src/qt/*/*.h src/wallet/*/*.cpp src/wallet/*/*.h src/support/allocators/*.h
sed -i 's/Prefer nullptr, otherwise SAFECOOKIE./Prefer NULL, otherwise SAFECOOKIE./g' src/torcontrol.cpp
sed -i 's/tor: Using nullptr authentication/tor: Using NULL authentication/g' src/torcontrol.cpp
sed -i 's/METHODS=nullptr/METHODS=NULL/g' src/test/torcontrol_tests.cpp src/torcontrol.cpp
sed -i 's/nullptr certificates/NULL certificates/g' src/qt/paymentserver.cpp
sed -i 's/"nullptr"/"NULL"/g' src/torcontrol.cpp src/test/torcontrol_tests.cpp
-END VERIFY SCRIPT-

src/zmq/zmqnotificationinterface.cpp

@@ -15,7 +15,7 @@ void zmqError(const char *str)
     LogPrint(BCLog::ZMQ, "zmq: Error: %s, errno=%s\n", str, zmq_strerror(errno));
 }
 
-CZMQNotificationInterface::CZMQNotificationInterface() : pcontext(NULL)
+CZMQNotificationInterface::CZMQNotificationInterface() : pcontext(nullptr)
 {
 }
 
@@ -31,7 +31,7 @@ CZMQNotificationInterface::~CZMQNotificationInterface()
 
 CZMQNotificationInterface* CZMQNotificationInterface::Create()
 {
-    CZMQNotificationInterface* notificationInterface = NULL;
+    CZMQNotificationInterface* notificationInterface = nullptr;
     std::map<std::string, CZMQNotifierFactory> factories;
     std::list<CZMQAbstractNotifier*> notifiers;
 
@@ -62,7 +62,7 @@ CZMQNotificationInterface* CZMQNotificationInterface::Create()
         if (!notificationInterface->Initialize())
         {
             delete notificationInterface;
-            notificationInterface = NULL;
+            notificationInterface = nullptr;
         }
     }