DEV-44838 - Fix a logic flaw in the windows run() retry code which would re-execute a process if its exit status was 0.

DEV-44838 - Add the string "DEV-44838" to assertion failures to future devs understand preconditions on windows run().

DEV-44838 - See if buildconsole is confused by having the absolute path (with spaces) in the commandline.  To accomplish this we put relative paths in the command string but lookup the absolute path for the executable parameter.

Member observers of LLSidepanelAppearance are now deleted appropriately.

DEV-44838 - Fix a silly bug in yet another place: find_in_path returns a list, so select the first element.

DEV-44838 - Fix another bug introduced by passing "executable" in WindowsSetup.run();  find_in_path() does not handle absolute paths, but name is guaranteed to be an absolute path.

This explains the bogus message in the log of the form "process $foo exited with nonzero status; process $foo is not found", described here:
https://jira.lindenlab.com/jira/browse/DEV-44838?focusedCommentId=328441&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_328441

The avatar inspector has a volume slider and mute button. We make
these widgets invisible when it does not makes sense to interact with
them. That is, when the inspector is for your own avatar, or when
voice is not active.

Enabled the button on the wearing tab of the appearance sidepanel and
set its functionality to switch to the my outfits tab before the auto-rename
happens.

Reviewed by Seraph

Displays the search floater and performs a search. You can specify an
optional category and an optional search string. See the wiki docs for
usage details: https://wiki.lindenlab.com/wiki/Viewer_2.0_SLapps

When the user clicks on the help "?" button, we try to find the
currently active tab and see if there is a help topic for that tab.
In addition, we now also look for a currently-visible accordion tab.

Both LLAccordionCtrl and LLAccordionCtrlTab should live in llui, not
newview. I need to make this happen in order to fix EXT-3929. No code
change was necessary (other than to change #include for predefined
headers) as these classes did not rely on any newview code.

Moved the media first-run dialog code from llviewerparcelmedia.cpp to llviewermedia.cpp, and made it come up for both prim and parcel media.

EXT-1847 Regression in the design spec: "You" should be replaced by your full avatar name in communication

-Reviewed by vir