Add the basic emoji dictionary class (responsible for loading them from disk and providing helpful lookup functions)

Create a separate segment for emoji characters so that we can display them in a slightly larger font size than the surrounding text

This reverts commit adb72456.

# Conflicts:
#	autobuild.xml
#	build.sh
#	indra/CMakeLists.txt
#	indra/newview/CMakeLists.txt
#	indra/newview/llappviewermacosx.cpp
#	indra/newview/llappviewerwin32.h
#	indra/newview/viewer_manifest.py
#	indra/win_crash_logger/llcrashloggerwindows.cpp

following promotion of DRTVWR-531

following promotion of DRTVWR-516

This reverts commit efc8b268.

# Conflicts:
#	indra/newview/app_settings/settings.xml
#	indra/newview/llvoicevivox.cpp

following promotion of DRTVWR-518

win_crash_logger will be fully removed in D520, for now just fixing local relwithdebinfo build