Match ugen/aio and ugen/reg_mgr

[LLONSIT]

• Match aio.p and reg_mgr.p thanks to @Synray
• Match some functions in cfe/codegen
• Document cat_files in ugen/binfile
• Document some parts of libu/ucio

[Unnunu]

Great work. I have a few comments, mostly about replacing numeric constants with the corresponding enum members.

[Unnunu]

This writes 8 bytes from the stack, which makes the code non-portable. It should be a single long long int, e.g. long long int sp20 = arg0;

[LLONSIT]

It should be a single long long int, e.g. long long int sp20 = arg0;

Well, this is the only match i found using a long long

void UW_CONST_i(int arg0) {
    union {
        long long l;
        int i;
    } sp20;

    sp20.i = arg0;
    UWRITE(&sp20, sizeof(sp20.l));
}

[Unnunu]

I think it’s fine

[LLONSIT]

Forgot to mention this in the commit messages, but i borrow the Uw_ types from this scratch made by @EllipticEllipsis

https://decomp.me/scratch/zvPvV