initial harfbuzz stuff
Link harfbuzz, implement rendering with glyphs
Merge branch 'refactor-syntax_unicode' of https://www.github.com/runrev/livecode into bugfix-12343
tweak libgraphics makefile
[[ Bugfix 12343 ]] Complete harfbuzz shaping implementation
Add replacement char when fallback fails
[[ Bugfix 12343 ]] Make sure directionalities are resolved for labels etc before being passed to HarfBuzz to avoid having embedded LTR text reversed
[[ HarfBuzz ]] Cleanup; add skia font callbacks to repo
[[ Bug 12343 ]] Added release note
Merge commit 'refs/pull/837/head' of https://github.com/runrev/livecode into refactor-syntax_unicode

Conflicts:
	libgraphics/Android.mk
	libgraphics/libgraphics.xcodeproj/project.pbxproj