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.World/CactusTile.cpp

@@ -11,8 +11,8 @@
 CactusTile::CactusTile(int id) : Tile(id, Material::cactus,isSolidRender())
 {
 	setTicking(true);
-	iconTop = nullptr;
-	iconBottom = nullptr;
+	iconTop = NULL;
+	iconBottom = NULL;
 }
 
 void CactusTile::tick(Level *level, int x, int y, int z, Random *random)