Props enthusiasts want it banned. Keep perseus working with this one weird trick.

Summary:
Well, that title isn't entirely accurate. We were copying onChanges
around onto our widgets{} props :(.

I also just serialized everything because of the few widgets that
still require that.

Also fix comments in the last audit.

Test Plan:
 * Make an input number in article.html
 * Edit the correct value to '5'
 * Make a new section
 * Copy paste the input-number
 * Change the correct value of this input-number to '56'
 * See the correct value change, and note that the
   original input-number's correct value did not change

Auditors: alex