Anti-raid levels don't by themselves do anything, but they can be
used in overrides to activate specific automod items.
Spam detection should now be more reliable and also combine further
spam messages after the initial detection into the archive.
Messages deleted by automod no longer create the normal deletion log
entry. Instead, the AUTOMOD_ACTION log entry contains the deleted
message or an archive if there are multiple (i.e. spam).
Since voice mutes cannot be re-applied unless the member is in voice,
we can't re-apply the voice mute automatically on join and would have
to do it later when they first join voice, which could get messy if
they were not supposed to be voice muted anymore after all (if they
e.g. don't use voice for a long time).
When reaction roles are set as exclusive, a user can only have 1
reaction role from that message. Others are removed automatically when
picking a role if needed.
