Don't block main thread if possible

SL-15223 FIXED "Reason: 'Not Found'" error message floater is shown when delete the unlisted listing folder

Log issue and try to recover

Linux specific contibution. Should not affect win and darwin. Doesn't include linux build, just an update to ensure changes gets pulled into uriparser's master when viewer gets promoted and to make sure nothing complains about issues with 'head revision'.

"prim_cost" and "description_label" do not appear to be in use, other cost data not in use

Original purpose of this code was to enable 'weights upload' if model has weights, preview was made to match this behavior, but previewing joints is expensive to init (genBuffers) and causes a freeze, so let users finish setting lods first, they can turn on preview later

following promotion of DRTVWR-515

Crash at getNormalID().isNull()

Remade code to use getCursorFromString

For god mode isInGroup was returning 'true' regardles of session id being group or agent id

Typing '}' via 'altgr+=' into a script makes the viewer to derender particles

Requested behavior: First install of a new viewer should never prompt to update to any RC.
Anfortunately neither viewer nor updater can tell the difference betwen RC and optional release update, so setting updater to download only required updates.

following promotion of DRTVWR-514

following promotion of DRTVWR-532

This reverts commit e61f485a, reversing
changes made to 00c47d07.

SL-12122 - removed frametime spikes in windows build caused by unnecessary call to GetPerformanceInfo()

following promotion of DRTVWR-519

CPU based detection in case Intel HD Graphics got detected