forgot a few things in image cog when cleaning up code.

# Conflicts:
#	roxbot/__init__.py

changed roxbot logging commands here so they no longer store the message themselves. But rather the output. This is for GDPR reasons. So we don't store user messages outside of what they can see and request to be removed. And rather move the identification of the user making roxbot output that message be linking the user with the outputs message ID.

# Conflicts:
#	roxbot/utils.py

* Clear embed on message deleted by user

* First pass at xkcd cog

* More work on xkcd, title matching, latest & typing while querying

* Move ;xkcd to fun cog

* Fix ;xkcd argument parsing

* Random function for xkcd, called by default (also fixed arguments)

* Refactor/cleanup xkcd

* Added message when random/latest used in xkcd command