Ability to load a directory as an IWAD

[nova++]

Kind of an esoteric feature, I know. This is entirely due to wanting to use version control in my project while running a custom IWAD, since otherwise something like git is just going to record changes to the file as a binary instead of any details of anything changed inside it. Apologies if this is already possible, I couldn't figure it out, and looking at the source seems like there's an explicit check against this.

[_mental_]

Duplicate.

[nova++]

Damn it. I searched for "iwad directory" but not "iwad folder" when seeing if anyone else had asked this. facedesk