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
Adding a new visual param that allows users to manually adjust an offset for
how far off the ground (+ or -) their avatar's root bone is.
Supports the +-2m range people are used to adjusting in their viewers, but
new implementation should support server-generated appearances.
Conflicts:
indra/newview/character/avatar_lad.xml
indra/newview/llagent.cpp
indra/newview/llcallingcard.cpp
indra/newview/skins/default/xui/en/strings.xml
