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/stubs.h

@@ -170,15 +170,15 @@ class ZipFile
 {
 public:
 	ZipFile(File *file) {}
-	InputStream *getInputStream(ZipEntry *entry) { return nullptr; }
-	ZipEntry *getEntry(const wstring& name) {return nullptr;}
+	InputStream *getInputStream(ZipEntry *entry) { return NULL; }
+	ZipEntry *getEntry(const wstring& name) {return NULL;}
 	void close() {}
 };
 
 class ImageIO
 {
 public:
-	static BufferedImage *read(InputStream *in) { return nullptr; }
+	static BufferedImage *read(InputStream *in) { return NULL; }
 };
 
 class Keyboard