Button to delete bot messages

A button to be added to every message from the bot that will delete the given message. Maybe only made available to the person who sent the command to the bot.

Locate the code paths that send messages from the bot and review how command senders and message deletion are currently handled. Clarify whether only the command sender may use the button, then verify that bot messages expose the button and that the agreed authorization and deletion behavior work consistently.

Written by the indexing model from the issue text.