Borer Bugfixes

Created by: Shadowmech88

Borers are now properly placed into severed limbs. Fixes #6629 (closed) Fixes #11114 (closed)

Being turned into a monkey no longer causes head borers to drop.

Fixes #10911 (closed) Fixes #11020 (closed) Fixes #11385 (closed)

The fleshshot is no longer capable of being dropped through any means.

As far as adjacent attacks go, arm borers' attack delays are now tied directly to their hosts (and, by extension, the other arm borer's). Fixes #11897 (closed)

What I did should fix #10911 (closed) and #11897 (closed), but I can't really test these alone. Every other fix has been tested.