Revert "Project modernization (#630)"

This code was not tested and breaks in Release builds, reverting to restore
functionality of the nightly. All in-game menus do not work and generating
a world crashes.

This reverts commit a9be52c41a.

Minecraft.Client/Common/Tutorial/ProgressFlagTask.h

@@ -17,7 +17,7 @@ private:
 	EProgressFlagType m_type;
 public:
 	ProgressFlagTask(char *flags, char mask, EProgressFlagType type, Tutorial *tutorial ) :
-	TutorialTask(tutorial, -1, false, nullptr ),
+	TutorialTask(tutorial, -1, false, NULL ),
 		flags( flags ), m_mask( mask ), m_type( type )
 	{}