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Fixes: "bandb - bandb failure: Unable to open sqlite database: unable to open database file"

I had the idea that maybe these should be case-sensitive because some
encodings (like Base-64) are. But it turns out it's better to
prioritise not breaking existing configurations / channel mode lists,
and just revisit this in future maybe.

[ci skip]

This should also be using strcmp(3), not irccmp().
No practical consequence (yet), it just makes more sense.

This reverts commit c1fc044c3594798cc5389486c361a7d9a43bc4f8.

SASL does not work with this commit in the tree.

This reverts commit f44a0d7e.

Also correct another minor memory leak

Otherwise we could read uninitialised data beyond the actual reply

When a server disconnects the client_exit hook will only be called once
but there could be multiple servers and clients behind that server.

After any client exits, check if the agent is still present.

point users towards HELP EXTBAN for inline help