refactor: convert final NULL instances to nullptr

Author: bobtista

Core/Tools/Autorun/Wnd_file.cpp

@@ -1337,7 +1337,7 @@ int Tell_File( HANDLE handle )
 	//
 	pos = SetFilePointer( handle,
                          0, // distance to move
-                         NULL,
+                         nullptr,
                          move_method );
 
 	if ( pos == 0xFFFFFFFF ) {

Core/Tools/WW3D/max2w3d/GameMtlPassDlg.cpp

@@ -209,7 +209,7 @@ BOOL GameMtlPassDlg::DialogProc(HWND hDlg, UINT message, WPARAM wParam, LPARAM l
 				// Loop through all the tabs in the property sheet
 				// Get a pointer to this tab
 				SetWindowPos(	hwnd,
-									NULL,
+									nullptr,
 									rect.left, rect.top,
 									rect.right - rect.left, rect.bottom - rect.top,
 									SWP_NOZORDER);

Core/Tools/WW3D/max2w3d/vxldbg.cpp

@@ -71,7 +71,7 @@ void VoxelDebugWindowClass::Display_Window(void)
 						(
 							AppInstance,
 							MAKEINTRESOURCE (IDD_VOXEL_DEBUG_DIALOG),
-							NULL,
+							nullptr,
 							(DLGPROC) _dialog_proc,
 							(LPARAM) this
 						);