Add update notifier. By default, the bot will join an updates channel and will inform the primary admin of important updates. See [Updates] in merlin.cfg for options.

(cherry picked from commit 29eca4f350e3b1c22ab8a2fee87b623b0c44d5c4)
Switch update notifications to legacy branch.
settings for #scans

Signed-off-by: Martin Stone <martin@d7415.co.uk>
Disabled more intel-based commands.

Signed-off-by: Martin Stone <martin@d7415.co.uk>
merlin.cfg: Options set to True *and* False. I need QC...

Signed-off-by: Martin Stone <martin@d7415.co.uk>
merlin.cfg: Changed case of #Scans to #scans.

Signed-off-by: Martin Stone <martin@d7415.co.uk>
New sharing settings.

Signed-off-by: Martin Stone <martin@d7415.co.uk>
Disable ScanQuota for Scans.

Signed-off-by: Martin Stone <martin@d7415.co.uk>
Disable 0-age non-JGP scan requests.

Signed-off-by: Martin Stone <martin@d7415.co.uk>
!req: Only show last 3 ticks of requests.

Signed-off-by: Martin Stone <martin@d7415.co.uk>