MAINT-3270 FIXED crash in LLControlCache<unsigned int>::LLControlCache: Control named RenderAutoMuteFunctionsnot found

MAINT-3193 FIXED crash with LLControlCache<bool>::LLControlCache: Control named RenderAutoMuteLoggingnot found.

BUG-3982 add code to subtract the lack of not removing the removal of backfaces for particles (make particles render double-sided again)

MAINT-3179 fix bad indexing of position info generating false alarms on range checks, issue with free of data now allocated contig with positions instead, and added copious amounts of llwarns to error return sites so 'invalid element' will be a reason to read the log and not a tease.

MAINT-3152 FIXED [MAINTENANCE RC] Confusing naming of Lighting and Shadows/Advanced Lighting Model options in graphics preferences

MAINT-3134 keep chat from opening in response to key confirm on quit dialog, fix mac-only sketchy precedence warning, and re-re-re-re-re-remove patch file that simply will not die.