It is definitely still there in git history, you just need to find the correct commit or tag - however there is no guarantee that you will be able to compile it with latest compiler/dependency versions
Quests cannot do that. It is world.gossip_menu_option BoxCoded column (and you have to write a script that implements this function https://github.com/TrinityCore/TrinityCore/blob/3.3.5/src/server/game/AI/CreatureAI.h#L207)