Remove extra exception logging

Fixed in https://bugzilla.mozilla.org/show_bug.cgi?id=503244
Parser: fix omitted parsing

guess they dropped 'posts' terminology
Remove references to `email` field

RIP in piece ;_;7
Remove Thumb substructure

No real advantage, while requiring an extra object.

Gonna remove the Image substructure too, to get
closer to the raw 4chan API. While it's still kind
of gross, it's not horrible, so might as well
standardize on it.
Remove FImage substructure

no bugs so far...