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/streams.h

@@ -479,7 +479,7 @@ public:
     {
         if (file) {
             ::fclose(file);
-            file = NULL;
+            file = nullptr;
         }
     }
 
@@ -487,7 +487,7 @@ public:
      * @note This will invalidate the CAutoFile object, and makes it the responsibility of the caller
      * of this function to clean up the returned FILE*.
      */
-    FILE* release()             { FILE* ret = file; file = NULL; return ret; }
+    FILE* release()             { FILE* ret = file; file = nullptr; return ret; }
 
     /** Get wrapped FILE* without transfer of ownership.
      * @note Ownership of the FILE* will remain with this class. Use this only if the scope of the
@@ -495,9 +495,9 @@ public:
      */
     FILE* Get() const           { return file; }
 
-    /** Return true if the wrapped FILE* is NULL, false otherwise.
+    /** Return true if the wrapped FILE* is nullptr, false otherwise.
      */
-    bool IsNull() const         { return (file == NULL); }
+    bool IsNull() const         { return (file == nullptr); }
 
     //
     // Stream subset
@@ -508,7 +508,7 @@ public:
     void read(char* pch, size_t nSize)
     {
         if (!file)
-            throw std::ios_base::failure("CAutoFile::read: file handle is NULL");
+            throw std::ios_base::failure("CAutoFile::read: file handle is nullptr");
         if (fread(pch, 1, nSize, file) != nSize)
             throw std::ios_base::failure(feof(file) ? "CAutoFile::read: end of file" : "CAutoFile::read: fread failed");
     }
@@ -516,7 +516,7 @@ public:
     void ignore(size_t nSize)
     {
         if (!file)
-            throw std::ios_base::failure("CAutoFile::ignore: file handle is NULL");
+            throw std::ios_base::failure("CAutoFile::ignore: file handle is nullptr");
         unsigned char data[4096];
         while (nSize > 0) {
             size_t nNow = std::min<size_t>(nSize, sizeof(data));
@@ -529,7 +529,7 @@ public:
     void write(const char* pch, size_t nSize)
     {
         if (!file)
-            throw std::ios_base::failure("CAutoFile::write: file handle is NULL");
+            throw std::ios_base::failure("CAutoFile::write: file handle is nullptr");
         if (fwrite(pch, 1, nSize, file) != nSize)
             throw std::ios_base::failure("CAutoFile::write: write failed");
     }
@@ -539,7 +539,7 @@ public:
     {
         // Serialize to this stream
         if (!file)
-            throw std::ios_base::failure("CAutoFile::operator<<: file handle is NULL");
+            throw std::ios_base::failure("CAutoFile::operator<<: file handle is nullptr");
         ::Serialize(*this, obj);
         return (*this);
     }
@@ -549,7 +549,7 @@ public:
     {
         // Unserialize from this stream
         if (!file)
-            throw std::ios_base::failure("CAutoFile::operator>>: file handle is NULL");
+            throw std::ios_base::failure("CAutoFile::operator>>: file handle is nullptr");
         ::Unserialize(*this, obj);
         return (*this);
     }
@@ -616,7 +616,7 @@ public:
     {
         if (src) {
             ::fclose(src);
-            src = NULL;
+            src = nullptr;
         }
     }