More so new build cross from Win32/Win64

Nothing much in the repo changed, this is a bigger update for my cross build tools from Win32/Win64 for building MS-DOS 4.00. I've switched the majority to this MASM386 I found somewhere (can't remember) as it's a Win32 native version, so no overhead, along with using the C/C++ compiler 8.00c which is also native Win32 greatly reducing the need for MS-DOS Player and greatly speeding up cross compilation.

On my machine it takes about two minutes to build the entire thing.