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/BlockReplacements.cpp

@@ -8,8 +8,8 @@ void BlockReplacements::staticCtor()
 {
     for (int i = 0; i < 256; i++)
 	{
-        byte b = static_cast<byte>(i);
-        if (b != 0 && Tile::tiles[b & 0xff] == nullptr)
+        byte b = (byte) i;
+        if (b != 0 && Tile::tiles[b & 0xff] == NULL)
 		{
             b = 0;
         }