[Core] Revert (c2518) Fix problem with scaling vmap model."

Does not Seem not stable enough so it's better to revert it.

Thank to @Beerfish, @Metal, @shnibble for their feedback and patience.

Thank to @Castro for its help to identify the commit problem.

1) This patch normally follows the map format specification.

2) It's now known that patch introduces some  regression bugs.

3) It's now known that patch doesnt fix any problems on classic (it was mainly needed on outland around Bio Dome).

4) It's known that old code worked well enough for classic.

That's why I choose to revert it.