MAINT-1953 Run through viewer stats and update GPU table with missing entries and new expected OpenGL versions

* Fix one race condition that could dereference a dangling pointer.
reviewed with Simon and Baker.

MAINT-1958 More robust error handling -- handle the case where the FBO allocation failure occurs when enabling lighting and shadows.

will run with higher connection concurrencies.  I'm using this to
test the listener queue length reporting on apaches and everything
is consistent and as expected with this change (stuck at eight before).

Reviewed by VoidPointer

Bumped the default retry limit up from 5 to 8 which gives up to
15 seconds more dwell time should the viewer get a 503 or other
recoverable error on access.

Reviewed by Simon

* Improve draw performance of scroll lists by only drawing what is visible
* Reduce frequency of expensive column width calculations
Fixes by Richard

* Remove debug spam

* LLScrollListControl to use LLAvatarNameCache instead of gCacheName

* Use LLAvatarNameCache in group UI to match what namelists use and prevent double lookups
* Remove LLSD -> Prams legacy pattern which is super slow.
* Member list on general tab only adds to the list after names are known

* Fix bad font name in llpanelgrouplandmoney

* llpanelgroupinvite to use LLAvatarNameCache isntead of legacy gCacheName

* Clean up 'is group' extra data in namelists.

* Split avatar name requests up among multiple frames to prevent overloading
  the nameserver and having requests time out.

MAINT-1228, MAINT-1668:  Deleting code that had been originally deleted to fix these issues, but then was accidentally re-introduced during a bad merge.