Show an aid to navigation's kind, not a speed or heading

A buoy's card, selected card and HUD readout showed "0.0KT · 135°" from
whatever its source reported. A fixed mark has neither, so they now show
its kind alone, whole ("CARDINAL MARK N", which the 14-character type cut
read as "CARDINAL MARK "), in the bone white of its disc.

isAidToNavigation now knows every kind an aid report names ("Light, with
sectors", "Fixed structure off shore" had no aid word), leaves out a
"Buoy Layer" as it does a tender, and matches each type text once: the
vessel layer asks per vessel on its rotation pass, which now skips the
aid discs it never turns.

Aid rows no longer cost ships their place: aisStreamRows lists every
vessel ahead of every aid, so the layer's 12,000-row request never drops
a ship for a buoy, and vessels_in_area (and the brief built on it)
counts ships only. An aid's name runs on into its NameExtension.

changelog.d/0000-buoy-models.md

@@ -2,6 +2,8 @@
   light or mark from the vessel feed (or any AIS station numbered 99MIDxxxx)
   is now the fleet set's buoy of its IALA mark (cardinal, port or starboard
   hand, safe water, isolated danger or special mark), standing still with no
-  heading, and its icon is a disc rather than a chevron. AISStream now
-  subscribes to aid-to-navigation reports and names each by its kind of mark
-  (samehkhamis, #0000).
+  heading, and its icon is a disc rather than a chevron. Its card and readout
+  show its kind of mark with no speed or heading. AISStream now subscribes to
+  aid-to-navigation reports and names each by its kind of mark and its full
+  name; the feed lists every ship ahead of any aid, and `vessels_in_area`
+  counts ships only (samehkhamis, #0000).