Use nullptr instead of NULL in the code and documentation

This is a combination of running clang-tidy with modernize-use-nullptr
check for some ports (GTK, X11, OSX) and manual changes to the ports for
which it couldn't be used easily (MSW, DFB) and also manually updating
the docs.

Also replace NULL with null or nullptr in the comments as this is more
consistent with the use of nullptr in the code and makes it simpler to
grep for the remaining occurrences of NULL itself.

And also use null in the assert messages.

Only a few occurrences of "NULL" are still left in non-C files, mostly
corresponding to unclear comments or string output which it might not be
safe to change.

tests/thread/atomic.cpp

@@ -135,7 +135,7 @@ TEST_CASE("Atomic::WithThreads", "[atomic]")
     for ( i = 0; i < count; ++i )
     {
         // each thread should return 0, else it detected some problem
-        CHECK (threads[i]->Wait() == (wxThread::ExitCode)0);
+        CHECK (threads[i]->Wait() == (wxThread::ExitCode)nullptr);
         delete threads[i];
     }
 

tests/thread/misc.cpp

@@ -104,7 +104,7 @@ wxThread::ExitCode MyDetachedThread::Entry()
         wxMilliSleep(100);
     }
 
-    return 0;
+    return nullptr;
 }
 
 void MyDetachedThread::OnExit()
@@ -140,7 +140,7 @@ public:
 
         //wxPrintf(wxT("Thread %lu finished to wait, exiting.\n"), GetId());
 
-        return 0;
+        return nullptr;
     }
 
 private:
@@ -181,7 +181,7 @@ public:
 
         m_sem->Post();
 
-        return 0;
+        return nullptr;
     }
 
 private:

tests/thread/queue.cpp

@@ -101,7 +101,7 @@ void QueueTestCase::TestReceive()
     int i;
     for ( i = 0; i < threadCount; ++i )
     {
-        MyThread *previousThread = i == 0 ? NULL : threads[i-1];
+        MyThread *previousThread = i == 0 ? nullptr : threads[i-1];
         MyThread *thread =
             new MyThread(WaitInfinitlyLong, previousThread, msgCount);
 
@@ -139,8 +139,8 @@ void QueueTestCase::TestReceive()
 // should return wxMSGQUEUUE_TIMEOUT.
 void QueueTestCase::TestReceiveTimeout()
 {
-    MyThread* thread1 = new MyThread(WaitWithTimeout, NULL, 2);
-    MyThread* thread2 = new MyThread(WaitWithTimeout, NULL, 2);
+    MyThread* thread1 = new MyThread(WaitWithTimeout, nullptr, 2);
+    MyThread* thread2 = new MyThread(WaitWithTimeout, nullptr, 2);
 
     CPPUNIT_ASSERT_EQUAL ( thread1->Create(), wxTHREAD_NO_ERROR );
     CPPUNIT_ASSERT_EQUAL ( thread2->Create(), wxTHREAD_NO_ERROR );
@@ -185,7 +185,7 @@ void *QueueTestCase::MyThread::Entry()
 
         if ( result == wxMSGQUEUE_NO_ERROR )
         {
-            if ( m_nextThread != NULL )
+            if ( m_nextThread != nullptr )
             {
                 wxMessageQueueError res = m_nextThread->GetQueue().Post(msg);
 

tests/thread/tls.cpp

@@ -65,7 +65,7 @@ public:
         wxASSERT( gs_threadData.name == std::string("worker") );
         wxASSERT( gs_threadData.number == 2 );
 
-        return NULL;
+        return nullptr;
     }
 };
 
@@ -112,7 +112,7 @@ void TLSTestCase::TestInt()
 
 void TLSTestCase::TestStruct()
 {
-    CPPUNIT_ASSERT_EQUAL( NULL, gs_threadData.name );
+    CPPUNIT_ASSERT_EQUAL( nullptr, gs_threadData.name );
     CPPUNIT_ASSERT_EQUAL( 0, gs_threadData.number );
 
     gs_threadData.name = "main";