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/DefaultTexturePack.h

@@ -5,7 +5,7 @@ class DefaultTexturePack : public AbstractTexturePack
 {
 public:
 	DefaultTexturePack();
-	DLCPack * getDLCPack() {return nullptr;}
+	DLCPack * getDLCPack() {return NULL;}
 
 protected:
 	//@Override