Rework Incoming section logic

We cannot assign notifications to the HUNing section during sort and
filter in NotifRankMan, because we don't know if those Notifications
can be placed there at that time. The VisStabMan can decide that they
cannot be moved, and so NotifSecMan can get confused when it sees
BUCKET_HEADS_UP in the middle of the shade.

In an ideal world, VisStabMan would inform the sort performed by
NotifRankMan, as opposed to "shooting it down" after the fact. The
main issue here is that NotifRankMan and NotifSecMan are logically
related (Notification ordering) but VisStabMan can throw a wrench in
that relationship.

Also I took the liberty of converting NotifSecMan to Kotlin. :-)

Fixes: 153554168
Test: atest, manual
Change-Id: I4d1d38eaf4eaac69542c7c115040e76ff95cc1c9