SL-9849 - color tweaks for dynamic bounding box. show impostor extents varies line thickness depending on how recently impostor was generated

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-9680, SL-9673 - set attachment distance floor at 0.01 to avoid triggering divide-by-zero prevention logic. Force HUD attachments to always be full detail.

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-8991: only escape log message characters once, add unit test
remove extra log line created by LL_ERRS
document that tags may not contain spaces

Sim apparently sends finish and start messages simultaneously in case of
scripted or experience teleports

SL-944 - logcontrol options to control which log recorders get used. This can be useful for performance reasons when especially verbose debug logging is needed.