SL-966 - behavior improvements and visualization, bonus removal of unrelated duplicate code in llappviewer.cpp

SL-9773 - treat animated object attachments the same as other rigged attachments for purposes of visibility in mouselook.

SL-1291 - fixed some issues with selection highlighting of objects rezzed while in build mode. Not clear whether this addresses the original issue, which isn't reproing

SL-966 - animated object size/pos constraints cont, including some settings for debugging. additional options to anim_tool.py for making test animations

SL-966 - size and pos limit calcs moved to sep method. Global scale option for testing of size limits.

MAINT-7926, MAINT-8400 - fixes related to bounding box and LOD calculations for rigged meshes in animated objects

MAINT-8671 - animated object rotation fix based on bind shape matrix of root prim, where applicable.

SL-915, MAINT-8554 - WIP on managing dynamic avatar bounding box, using to constrain encroachment by animated objects

MAINT-8608, MAINT-8539, MAINT-8615 - changes to make object animation info more persistent, tolerant to race conditions during initialization

MAINT-8239 - problems with some instances failing to load some joint positions. Added DumpXML and Reset Skeleton support for animated objects when debugging.

SL-704 - made avatar hierarchy more consistent by adding lluiavatar for viewer-local avs used in upload previews