This removes most of the special behavior around how -r/--hot and
-i/--enumerate interact. This does mean -r/--hot risks folding results
if -i/--enumerate is not specified, but this is _technically_ a valid
operation.
For most of the recursive result scripts, I've replaced the "i" field
with separate "z" and "i" fields for depth and field number, which I
think is a bit more informative/useful.
I've also added a default-hidden "off" field to structs.py/ctx.py, since
we have that info available. I considered replacing "i" with this, but
decided against it since non-zero offsets for union members would risk
being confusing/mistake prone.
Christopher Haster
748815bb46