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/AbstractTexturePack.h

@@ -89,5 +89,5 @@ public:
 	virtual unsigned int getDLCParentPackId();
 	virtual unsigned char getDLCSubPackId();
 	virtual ColourTable *getColourTable() { return m_colourTable; }
-	virtual ArchiveFile *getArchiveFile() { return nullptr; }
+	virtual ArchiveFile *getArchiveFile() { return NULL; }
 };