Add framework for admin commands (reserved to channel ops),
and introduce the wipe command (cleans up the database).
Answer to commands, even if everything worked fine.
Limit access to the bot to voiced or oped users in the target
channel. This lets us use ChanServ to autovoice users but also
give temprary access to anyone on-channel as necessary.
Move from at/until to now/next API for the bot, which is
simpler to explain. Adapt rendering so that it supports
multiple "next" entries.
Add JSON backend and basic command to update it.
Basic bot skeleton, no functionality yet.