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/addrman.h

@@ -220,11 +220,11 @@ protected:
     FastRandomContext insecure_rand;
 
     //! Find an entry.
-    CAddrInfo* Find(const CNetAddr& addr, int *pnId = NULL);
+    CAddrInfo* Find(const CNetAddr& addr, int *pnId = nullptr);
 
     //! find an entry, creating it if necessary.
     //! nTime and nServices of the found node are updated, if necessary.
-    CAddrInfo* Create(const CAddress &addr, const CNetAddr &addrSource, int *pnId = NULL);
+    CAddrInfo* Create(const CAddress &addr, const CNetAddr &addrSource, int *pnId = nullptr);
 
     //! Swap two elements in vRandom.
     void SwapRandom(unsigned int nRandomPos1, unsigned int nRandomPos2);