Fix ups for 6525ccc384ca8ae6fe4f3fda6b7bb57156691706

If log_path is empty, we shouldn't setChatLogsDir to it.
In fact, this may have been the cause of something Nomade Zhao brought up.

Also, InstantMessageLogPathAnyAccount was accidentally being set as a PerAccount
Merge remote-tracking branch 'lirusaito/master'
SH-4044 FIX voice dot is offset vertically if using avatar height offset

Added the height offset in one too many places. fixing.
SH-4050 FIX camera goes below ground when avatar offset set to 0

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.

Conflicts:

	indra/llappearance/llavatarappearance.cpp
SH-4059 FIX other's hover parameters affects your avatar's setting

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