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/support/allocators/secure.h

@@ -45,7 +45,7 @@ struct secure_allocator : public std::allocator<T> {
 
     void deallocate(T* p, std::size_t n)
     {
-        if (p != NULL) {
+        if (p != nullptr) {
             memory_cleanse(p, sizeof(T) * n);
         }
         LockedPoolManager::Instance().free(p);

src/support/allocators/zeroafterfree.h

@@ -36,7 +36,7 @@ struct zero_after_free_allocator : public std::allocator<T> {
 
     void deallocate(T* p, std::size_t n)
     {
-        if (p != NULL)
+        if (p != nullptr)
             memory_cleanse(p, sizeof(T) * n);
         std::allocator<T>::deallocate(p, n);
     }

src/support/events.h

@@ -47,7 +47,7 @@ inline raii_evhttp_request obtain_evhttp_request(void(*cb)(struct evhttp_request
 }
 
 inline raii_evhttp_connection obtain_evhttp_connection_base(struct event_base* base, std::string host, uint16_t port) {
-    auto result = raii_evhttp_connection(evhttp_connection_base_new(base, NULL, host.c_str(), port));
+    auto result = raii_evhttp_connection(evhttp_connection_base_new(base, nullptr, host.c_str(), port));
     if (!result.get())
         throw std::runtime_error("create connection failed");
     return result;

src/support/lockedpool.cpp

@@ -28,7 +28,7 @@
 
 #include <algorithm>
 
-LockedPoolManager* LockedPoolManager::_instance = NULL;
+LockedPoolManager* LockedPoolManager::_instance = nullptr;
 std::once_flag LockedPoolManager::init_flag;
 
 /*******************************************************************************/
@@ -87,7 +87,7 @@ template <class Iterator, class Pair> bool extend(Iterator it, const Pair& other
 
 void Arena::free(void *ptr)
 {
-    // Freeing the NULL pointer is OK.
+    // Freeing the nullptr pointer is OK.
     if (ptr == nullptr) {
         return;
     }