SL-19078: pull in 3p versions of the emoji/shortcode mapping XML files - 1 for each language that the viewer supports except sadly, Turkish which is not available so far

SL-19078: add filename of emoji/shortcode XML files to ignore list so Viewer checkouts don't appear to be polluted with files from 3p libs

DRTVWR-489: pull in a version of 3p-ICU4C from the branch called DRTVWR-489-emoji (identical to VS 2019) but lines up the branches for the otehr 3P packages this work uses

DRTVWR-489: Fix things up after a messy merge with main because of a gigantic CMake patch. Sadly, my macOS box updated to Xcode14.3 overnight and that caused many warnings/errors with variables being initialized and then used but not in a way that affected anything.. Building on Xcode 14.3 also requires that MACOSX_DEPLOYMENT_TARGET be set to > 10.13. Waiting on a decision about that but checking this in in the meantime.  Builds on macOS with appropriate build variables set for MACOSX_DEPLOYMENT_TARGET = 10.14 but not really expecting this to build in TC because (REDACTED). Windows version probably hopelessly broken - switching to that now.

DRTVWR-489-emoji-PR: Pull in a version of Collada that has std::auto_ptr replaced by std::unique_ptr so it builds on modern mac systems

following promotion of DRTVWR-573

to make it accessible after updating the viewer

# Conflicts:
#	indra/cmake/Copy3rdPartyLibs.cmake
#	indra/cmake/FindOpenJPEG.cmake
#	indra/cmake/OpenJPEG.cmake
#	indra/integration_tests/llui_libtest/CMakeLists.txt
#	indra/newview/CMakeLists.txt

The viewer currently presents a startling "Grid emergency" warning if an
unrecognized error is returned from login. Let's tone this down a bit
and present the error as it is: an unrecognized login failure rather
than SLearth exploding.

Drtvwr 489 emoji

added missing app setting

Xcode 14.1

DRTVWR-489-emoji: As part of the work to get macOS version of the Viewer working, the flag was introduced to warn (and therefore error out) when a virtual override was not marked with the 'override' keyword. Fixing this up involved a large number of changes and this commit represents just those changes - nothing specially from the DRTVWR-489 viewer

(Cherry pick of 3 commits from Callum to declutter the emoji PR: 3185bdea,
923733e5 and 6f31fabb)

Feature described at https://community.secondlife.com/blogs/entry/12652-coming-soon-to-a-viewer-near-you-group-chat-history/

This makes no sense, trying to add a glyph now will have no width or height set, neither character width or heigh, yet release viewer does that. Fixed code to match release and set width and height despite char width not being up to date.

following promotion of DRTVWR-570

This reverts commit 4d429b7e.

DRTVWR-489-emoji: less haste. more speed.  Missed another test issue. Rebuilt locally with tests and confirmed it works now

DRTVWR-489-emoji: Pull in the updated version of GoogleMock that was updated to Python3 so that it builds on macOS in TeamCity