SL-19336 Unload avatar and group icons from memory when not visible to reduce memory pressure on extremely large friends lists

original fix by Beq Janus

Nicky Dasmijn's contribution for zlib-ng Linux builds

This reverts commit 8215fff0.

# Conflicts:
#	indra/newview/lltoolpie.cpp

SL-16127: Make another pass removing redundant LLSD op [] calls, unused vars, and use atmospheric already calculated

SL-16127: Make another pass removing redundant LLSD op [] calls, unused vars, and use atmospheric already calculated

Add in the JIRA (SL-15398) describing the contribution from FS:Ansariel to the contributions.txt file

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'.

Contribution by Rohacan Hirons

SL-14717 Follow ups

SL-14717 Using the cached setting in LLToolPie::handleHover()

This reverts commit b1ab29ee.

This reverts commit 88746478.

fix by Ansariel (https://vcs.firestormviewer.org/phoenix-firestorm/changeset/dace23b988af90a65ef57b0b9f540fc48d439dc3)