[Feature] Per-".zdl file" save game directory

[qs-arno]

I may not be asking this question the best way, so let me try and explain...basically, I create a separate *.zdl file for each PWAD I play, and that overall environment (PWAD(s), engine, IWAD, DMFLAGS, etc.) I think of as a "profile".

I would like it if each time I launched a different "profile", the save games would be unique to that "profile".

Currently, when I go to load/save, most of the options won't work because they're not related to the PWAD I'm currently playing. Obviously that's not ZDL's fault, but it'd be nice to have them separated out.