This fixes mostly formatting issues so there is no longer any diff with
things after rerunning the generation script. Yes, most of this can be
fixed by running wpiformat but that doesn't exist as a pre-commit hook
atm, so I think this is nicer.
It also removes any reference to the java encode/decode within the
python message gen
I made a mistake when cherry-picking things into #1534. Fixing it also
prompted me to regenerate message things without thinking even though it
wasn't needed here but it helped me catch an issue with a bad shim. I
must not have saved it properly on my computer and missed it before
review.
