#61 DLL interface

[Stefano Antoniazzi]

I fully share BASIC-256 goal of helping to learn programming avoiding all complex stuff.
However, some additional feature could open doors towards a more widespread usage.
In particular, I would like to propose some simple interface to foreign code in DLLs.
While writing DLL is not in the capability of typical BASIC-256 users, expert people could easily develop add-ons or customizations independently for dynamic linking.
p.s. I asked the same to Yabasic author and he eventually implemented it.