Somehow viewer-cat acquired a lot of source lines (in several different files)
of the form:
    (void)somevar;
where ?somevar? was not declared. Apparently someone introduced an unused
declaration of ?somevar?, encountered unused-variable warnings, introduced the
(void) casts to suppress those warnings, then deleted the declarations --
without deleting the (void) casts. It seems worth noting that the resulting
code should not have compiled successfully on any platform.

Added an additional sanity check to make sure that other avatars don't
affect your wearables.

Reviewed by Kelly

Reverting fix as additional problems were found that could lead to even accidental nudity.
This fix is not required for the current release as it is not a regression.
Will review options for fixing for the next release.

Added a constraint to ensure that the avatar's height (with offset)
does not go below 0.1 meters. Camera was getting confused since the avatar's
effective height was negative.

Note the avatar is mostly underground/contorted even at 0.1 meters, but
most users setting values this low will be making ultra-tinies and would
be hiding the avatar mesh. Camera stays above ground when height is at 0.1.