Feature: add clones without cloning C/V ROM

[Rolel]

Hello,

As original 161in1 setup, it would be nice to be able to add some clones without using C/V rom space. I think about MetalSlub2 / 2Turbo, Shocktroopers that exists with 2 P1rom that don't score the same way, and maybe not "creepy" ROM hack.

I didn't had a look deep into compiler, currently I only suggest the idea. Any guideline and advice is appreciated.

Regards